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yukirayu: I've updated the timeline as much as possible (and will continue to do so whenever I can), though I do advise that you check my remarks (in another sheet named as such) for any additional notes I have with regards to the timeline and the information in it.
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The events here cover everyone's backstories up to the present, right before the plotline diverges into a specific route (for the parent game). While some characters appear in certain routes only, it's easy to tell what has happened and what has yet to happen, whether or not X's route is taken.
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Also, a lot of the cells in the timeline have a note attached to them, so it's important that you don't overlook them as they provide (what is hopefully helpful) explanation/context.
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YearRyuujirou TakasatoHideyasu SakakiMasami ToonoMayaTaeko HasegawaTajima's OwnerTakuma MuraseTowaRei IzumiMr. IzumiKei MadarameKagaKurahashiRyou FujiedaMei YuzukiTakashi IkuinaKazuki AsakuraHayatoMizunoMegumu KiriharaEiji KobayakawaKotarouMayuTooru IgarashiLisa InoueArataJunkoHonamiTsukasa ArimuraShiroBakuKimikaRuu
7
1971Birth0
8
19721
9
19732
10
1974Started kindergarten3
11
1975Birth04
12
197615
13
19772Started elementary school6
14
1978Started kindergarten37
15
197948
16
198059
17
1981Started elementary school610
18
1982711
19
19838Started middle school12
20
1984913
21
19851014
22
198611Started high school15
23
1987Started middle school1216
24
19881317
25
198914Started working as a nightclub hostess18
26
1990Started high school1519
27
19911620
28
19921721
29
1993Started university (4 years minimum)1822
30
19941923
31
19952024
32
19962125
33
19972226
34
19982327
35
199924Moved to Shinkoumi with her (now-late) husband 28
36
20002529
37
200126Birth (born as Yuma Sakuragi)030
38
200227131
39
200328232
40
200429Started kindergarten333
41
200530434
42
200631Birth0535
43
2007321Started elementary school636Birth0
44
20083327Birth0371
45
200934Started kindergarten381382
46
20103549239Birth (born on September 22)0Started kindergarten3
47
2011365Birth010Started kindergarten34014Birth (full name unknown)0
48
201237Started elementary school6111441251
49
20133872Started middle school12542Started kindergarten3Started elementary school6Birth (full name unknown)02
50
2014398Started kindergarten313Started elementary school643471Started kindergarten3
51
20154094147445824
52
201641105Started high school15845Started elementary school69Started kindergarten35Birth0
53
20174211Started elementary school616946710Birth (born on December 4)04Started elementary school61
54
201843Started middle school1271710478111572
55
201944138Started dropping by on Tajima's (the candy shop) on occasion for shelter as she struggled to get by while working as a hostess1811Helped look after Maya whenever the latter visited her store while struggling to work as a hostess489Started middle school122Started elementary school68Started kindergarten3
56
20204514919Started middle school12491013Was subjected to intensive training by his grandfather in the hopes of turning him into a mercenary like the rest of his family3794
57
202146Started high school1510201350111448105
58
2022471611211451Started middle school12Started high school155911Started elementary school6
59
20234817Started middle school1222Started high school15521316610Started middle school127Birth (full name unknown)0
60
202449Started university (4 years minimum)18132316531417711138Birth01
61
2025Assumed the role of contractor for the reconstruction of what is now recognized as Shinkoumi (previously known as Tokyo Waterfront City No. 13)501914241754Started high school (he and Toono attended the same school)15188Started middle school12149Birth012
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2026[Had probably] met Maya at around this age, because Sakaki had also said that Ryuujirou had "fallen for her at first sight"5120Started high school (he and Taku attended the same school)15* [Had likely] encountered Ryuujirou when she was around this age; and according to Sakaki, he almost immediately became infatuated with her as soon as he laid eyes on her
* Became Ryuujirou's mistress, to which she started using her new connection to secretly manipulate the Takasato Group from the shadows		251855Taku's parents divorced, and he and his mother were plunged into poverty as a result, which soon led to his mother's drug addiction1619913Started high school151012Birth (born as Tsuyoshi Moriya, on March 19)0Started kindergarten3
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202752Became acquainted with Maya (complete with becoming her lackey/right-hand man) some time after she became Ryuujirou's mistress211626Got into debt with the Takasato Group for reasons unknown, and thus started working at Cielo, where she was first introduced to Maya19561720101416112Started kindergarten31Birth (born as Kouji Ayano)0Birth (full name unknown)04
64
20285322Approached Taku and offered to pay for his tuition and his mother's hospitalization bills... provided that he majored in pharmaceutical science17First opened Euphoria, her child prostitution business272057Went to a public medical school, but then changed his undergraduate major to pharmaceutical science at Toono's urging, with the incentive of having his tuition and his mother's hospitalization being covered182111* Started high school
* Joined the Takasato Group as a subordinate		1517Birth (born as Minato Yuzuki, on June 25)0Started middle school12Started kindergarten34Birth02115
65
20295423182821581922121618113451Birth (born as Arata Fuse)0Started kindergarten322Started elementary school6
66
2030Bought the property rights to Shinkoumi, allowing the Takasato Group to take full control over the reconstruction of the city, as well as the have the right to govern the city itself552419Gave birth to Towa on March 729225920Birth (born as Haruto Sakuragi, on March 7)

Time of birth: 2: 47 p.m.		023First crossed paths with Kurahashi1317First crossed paths with Madarame192145Started elementary school6Birth (born under a different name)0214Started kindergarten3Started kindergarten37
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203156252030After working at Cielo for some time, she was suddenly called by Sakaki to assist Maya with her work (which Hasegawa is warned to not speak to anyone else about), in exchange for her debt being cleared2360211Birth (born on April 27)0Moved to Shinkoumi from the mainland (along with his then-wife), shortly before Rei's birth2414Cut ties with the Takasato Group after they took over Shinkoumi, out of disgust for the group's increasingly extreme way of doing things, and even left the city afterwards1820Started kindergarten3Started high school15Started elementary school67Birth01Birth0Started kindergarten3254Birth (born under a different name)048
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2032572621312461`222125Killed his entire family/household and fled, evading the organization as they searched for him for some time1519Was working in the criminal underworld of South America around the time Madarame murdered his entirely family 21He was (possibly) at this age when discord began in the Yuzuki family4Birth016781214Started kindergarten3Started elementary school65Birth0159
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2033582722Started forcing Towa to serve her clients when he was either 3 or 4 years old32256223* Started kindergarten
* It is strongly hinted that Towa was only 3 or 4 years old when Maya started prostituting him		322616Some time after he left, a few of the Takasato Group's members reached out to him and asked him to return, which he reluctantly did, but joined an affiliated organization instead of working directly under the Takasato Group once more202251Birth01789232547Started elementary school612Started elementary school610
70
2034592823Bought the multicolored painting for Towa, but then gave it to the candy shop owner instead3326Was given the multicolored painting by Maya years after the latter's last visit to the store. This is the same painting that Towa perceives as one of an entirely black background63Started his master's degree in pharmaceutical science244Started kindergarten327172123Started elementary school621Started medical school1891034Started kindergarten3Started elementary school65872Started kindergarten3711
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20356029Was asked by Taku if he could reenroll in medical school, which Toono agreed to. But not long after, Taku fell into a depression after his mother's unexpected death, and he and Toono hadn't spoken since243427642554281822247Started kindergarten3219Birth (born as Nozomu Kirihara)010114547Started elementary school698Started kindergarten3Birth048Started middle school12
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2036613025352865Re-enrolled in medical school after getting Toono's approval, but right when he did, he's informed of his mother's death and he fell into a depression, and stopped talking to Toono26Started elementary school6529Not confirmed, but he's likely at least 18 or 19 when he joined the Takasato Group19Had (likely) gotten to know Madarame after the latter had joined the Takasato Group on a whim232584Started kindergarten320111Started middle school125* Started elementary school
* Began hunting for leisure, as well working as a mercenary, from [at least] the age of 6 		6587109415913
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20376231Approached Taku once more and informed him about his newfound association with the Takasato Group... and about what he has planned for Taku to do in "repayment" for all the money he lent him26362966Continued to suffer from depression and grief, which affected how he behaved in class. At some point, he even contemplated suicide... but then Toono approached him and told him that the Takasato Group (which he had joined), had a job for Taku to do; if Taku refused, Toono would invoice him the entire amount he paid on his behalf277Started elementary school630202426954212Started middle school121367Started elementary school698111052Started elementary school61014
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2038633227373067288It is at least in elementary school when his parents divorced, after which his mother left and he moved with his father 7Divorced his wife because of his gambling addiction, which sent his family into an increasingly troubled financial situation3121252710Started elementary school6522Started kindergarten31314787109Started middle school1211Started elementary school637Lost his eldest sister after she committed suicide in the mountains one month after her disappearance11Started high school15
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2039643328Arranged for Ikuina, Asakura and Kirihara's "euphoric sessions"383168Some time after getting reluctantly involved with the Takasato Group, even when he would still be a doctor-in-training around this time, he became assigned to Towa as his personal physician29* Ikuina, who was 6 to 7 at the time, cut him and gave him the large scar on his chest
* Asakura cut him on his shoulder blades (he was described as a child at the time, which would be in line with how old Asakura would be while still studying in medical school)
* Towa is generally described to look like an elementary school student when Megumu Kirihara cut his collarbones (something commented at by Nozomu while watching his brother's video)		9832Went to South America with Kaga and a few other members on the Takasato Group to conduct a business-related inspection22Went to South America with Kaga and a few other members on the Takasato Group to conduct a business-related inspection26* Met Madarame again when he and Kaga went to South America to conduct business on the Takasato Group's behalf
* Upon observing how Madarame had calmed under Kaga's influence, Kurahashi was motivated to go to Shinkoumi and join the Takasato Group, where he eventually became Kaga's right-hand man		28117* Started elementary school
* According to the extras, he was around 6 or 7 when he discovered his father's disturbing hobby
* Later on, he was brought to Euphoria by his father and coerced into slicing Towa's chest, resulting in him inheriting his father's obsession with cutting people up to see their insides (although Ikuina barely remembers the incident afterwards)		6While studying in medical school, he was lured by a professor he respected to Euphoria, and manipulated into cutting a young Towa by his shoulder blades. Rumors started to circulate about him being a potential pedophile afterwards234* In between his final year of middle school or his first year of high school, he got the opportunity to pay a visit to Euphoria and slash Towa to his heart's content (with notable scars left on the latter's collarbone)
* Started high school at around 15 years old		14Started high school15898111013Started middle school12748* Started middle school
* On his first year, his second eldest sister died after overdosing on sleeping pills
* His third eldest sister disappeared shortly after the second's demise, though was soon found a few months later (by which she had already joined, and been converted by, a religious cult)		1216
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20406534293932693010He's described to have suffered bullying throughout elementary school due to his fair appearance, to which he soon learned self-defense to be able to fight back against his aggressors9Worked for the Takasato Group by trafficking children to Euphoria33232729Started middle school12872 years of medical residency24515169109Started middle school12111413859Some time after his third sister's return (where she then isolated herself from her family), she called for Kimika to assist with her suicide via hanging1317
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204166353040337031111034242830Was abandoned by his father, who found another woman, resulting in the escalation of his mother's abuse13Was abandoned by her father, who found another woman, resulting in the escalation of her mother's abuse9825Started elementary school6161710111013Started middle school12Started high school1514961014Started university (4 years minimum)18
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2042673631413471Finally graduated medical school, after being held back by a year due to neglect of studies32Started middle school (he and Rei attended the same school)1211352529311410926717Started university1811Started middle school1211141316Started high school1510711Started high school1519
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204368* Killed Mei Yuzuki on Maya's orders
* Tended to Maya on her deathbed and was given one final order by her, which he may nor may not act on 12 years later		3732* Ordered for Mei Yuzuki's death
* Died on December 26, some time after falling down the stairs (the exact date of this event is unspecified) from a failed attempt at filicide		42Was still working in Euphoria when Towa and Mei tried to escape (albeit unsuccessfully)35722 years of medical residency at Shinkoumi General Hospital33* Attempted to escape Euphoria with Mei's prompting, although they were eventually caught
* Accidentally killed Maya during a struggle, and the incident left him hospitalized for some time		13Started middle school (he and Towa attended the same school)1236263032* After graduating middle school, he didn't go to highschool and immediately started working several part-time jobs instead to save enough money for him and Mei to be able to live on their own
* Later on, however, he found out that his mother had sold Mei off, to which left home to look for her. After weeks of futile searching, he nearly died but was found by a woman who owned a host club, and he started working there		15* Got sold off by her mother to Euphoria, where she befriended Towa, who she was assigned to as his playmate
* In time, she tried to help Towa escape; although they both got caught, and Mei was killed as punishment		111027818191213Started middle school12Started high school15141716118* Started middle school
* Lost both his parents in a car accident, which led to him becoming more belligerent at school		121620
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204469Some time after Maya's passing, he approached Towa and introduced himself as a family friend3833Euphoria closed after Maya's death, and so Hasegawa was released from her services, but was warned again to never speak about Maya or what happened in the mansion367334After recovering, his behavior drastically changed (e.g. drinking, smoking, sleeping around with other men). Likewise, he lost his memories of nearly his entire childhood after the "accident", to which he soon unconsciously discarded his old name and took on the name "Towa"14It was possibly around his second year when he took notice of Towa's presence and subsequently developed a crush on him1337273133Started high school to get the diploma needed to study in a university

Note: An alternative can be this exam, which if passed can waive the requirement for a high school diploma, though the applicant still can't enroll in a university until they're at least 18		16112891920Started participating in Deathmatches at least around this age range13141316Started high school15Started university (4 years minimum)1817Started middle school129131721
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2045Started to fall ill around the time conflict arose in the Takasato Group regarding its rules and management, with Kaga and Sakaki/Toono having strong disagreements about the matter, which eventually resulted in Kaga's death70Invited Towa to join the Takasato Group39343774* Worked as a doctor at Shinkoumi General Hospital until he reached the age of 40
* May have also undergone more training during this time to get licensed for his other specialties, since Taku has a total of four: internal medicine, surgery, gastroenterology, and dermatology; and not all can be attained in a single residency		35* Started high school at 15; also likely to have joined the Takasato Group by then after he was invited by Sakaki
* Started sleeping with Madarame		15Was disowned by his father after his attraction to other men was revealed, resulting in his conflict about his own identity14Disowned Rei after finding out about his son's sexuality38Started sleeping with Towa some time after the latter had joined the Takasato Group28After Towa joined the Takasato Group, and especially after he and Madarame entered something of a "friends with benefits" relationship, they and Kaga started hanging out together every now and then323417Started middle school12291020Started training in a police academy2114Moved to Shinkoumi, then started participating in Deathmatches—both occurring around this age1514171619Started university18131014Started university1822
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204671403538753616Started high school (though he and Towa went to different high schools this time)1539293335Started law school (though if he took the Proficiency Level of Upper Secondary School Graduates exam, he'd likely start at 18 instead) and the money he'd earn from his clients to fund his tuition181330Birth (full name unknown)0112122Was recruited into the Takasato Group (alongside Mayu) for his exceptional skill in Deaathmatches15Was recruited into the Takasato Group (alongside Kotarou) for his exceptional skill in Deaathmatches16Started high school15Started university (4 years minimum)181720191411Started high school151923
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20477241363976371716403034361914311Started middle school12222316171619Started univesity, with music as their undergraduate major182120Started high school15* Was hospitalized some time after his mother's abuse worsened due to permanently losing her good looks from a violent client
* After he recovered enough, he was sent to a facility for children who are either orphans or whose parents are unfit to raise them		121620* Got fired for punching a coworker who bullied his peers
* Saw a job advertisement for Sara-ya, to which he then moved to Shinkoumi		24
84
2048734237407738Started painting as 'euphoria' after graduating high school18174131353720Started high school153221323* Volunteered to infiltrate Shinkoumi and provide information about it to the mainland to aid in their attempts at a takeover
* Started hacking into some of the Takasato Group's websites, which caught their attention enough to hire him		241718172019Got a job at a foreign makeup company
222116* Left the facility after word spread around about him sleeping with the other people there
* Some time later, he started living with an old man who kept/treated him like a plaything... though after a few months, the man died from an altercation with a gang. Upon seeing the old man's corpse, Shiro became obsessed with the concept of death		13Graduated highschool, then immediately after, he used his inheritance money and his part-time earnings to move to Shinkoumi, where he started working at Sara-ya17Moved to Shinkoumi after completing his studies to live farther away from his family2125
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2049744338417839Soon after he began his painting profession, he and Rei crossed paths again (Rei sent Towa an email request; then they met up at Roost)19Left home immediately after graduating high school. Not long after, he approached Towa (first via email, then at Roost) and asked to be his art model, then attempted to penectomize himself1842323638Graduated law school and became a public prosecutor211633Started kindergarten31424251819Joined the Takasato Group18212023Started working at Roost (main job)2217Started working as a prostitute while frequenting any areas with corpses whenever he had the time1418* After working as a hairdresser for some time, he joined Sara-ya (from a job advertisement shown by a friend), where he got partnered with Ruu
* Overdosed on sleeping pills at some point when he was emotionally/mentally at his lowest		22Decided to team up with Kimika after working in Sara-ya for "a long time", long enough that he was no longer considered or called a rookie in his job26
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205075Decided that Kaga had to die due to conflicting beliefs on how to lead the Takastao Group, and requested Toono to shoot Kaga as a show of his loyalty44Betrayed Kaga and shot him dead, then after a failed negotiation with Madarame, accidentally ended up shooting Towa in the eye before managing to shoot Madarame (albeit non-fatally)394279* Operated on Towa's ruptured eyeball (while still working at Shinkoumi General Hospital)
* Some time later, he opened his own clinic after borrowing some money from the Takasato Group		40* Lost his right eye in a shootout (Toono attempted to shoot Madarame but Towa dived in and took the bullet)
* Had his damaged eye operated on by Taku in Shinkoumi General Hospital. After that, his personality lost its rebellious and temperamental edges
* After Taku's clinic opened, Towa visited it often to have his eye checked on, and in time, he settled down there, and later on, would get a job in the clinic as well		20* Started working at Roost as his main job
* Underwent training in body art / body modification		1943Got shot at by Toono when the internal conflict in the Takasato Group reached its peak, which led to Kaga's murder. Madarame was assumed dead, but had actually survived and escaped to overseas, and kept in touch with Eiji, Kotarou and Mayu since then33Died after Toono shot him when the infighting in the Takasato Group reached its breaking point37Severed ties with the Takasato Group after Kaga's death then returned to South America; although he continued trading with Sakaki and Toono (mainly weapons)39Passed the bar examination and took on a one-year apprenticeship at a law institute2217344Started high school152526192019Started training in a police academy2221
Began working part-time at Roost		2423Started university (4 years minimum)18* Met Baku, who was on duty and found him among the dead bodies he was sleeping close to
* Ever since then, he frequently visited Baku's workplace because of how they work closely with death		15A year after he started his new job, he encountered Shiro in a scene he was assigned to "clean up"192327
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2051764540438041Suffered a near-death experience after an interaction with a potential art model went horribly wrong21* Started working part-time at Murase Clinic
* Began participating in Deathmatches		20443440Became a public prosecutor after completing his apprenticeship23Started university (4 years minimum)1835516262720212023* Became acquainted with Rei and started participating in Deathmatches with him
* Started working at Roost (main job) and at Murase Clinic (part-time)		22* Became acquainted with Rei and started participating in Deathmatches with him
* Started working at Murase Clinic as a nurse as their primary occupation 		25* Became acquainted with Rei and started participating in Deathmatches with him
* Got a part-time job at Murase Clinic		2419* Started dating Baku, to which he quit his job as a prostitute, and found a new job at Sara-ya
* Some time after they became a couple, they decided to live together		16* Started dating Shiro some time after meeting him, and eventually moved in with him
* Some time after they became a couple, they decided to live together		20* Got introduced to Baku and Shiro, the latter of whom Kimika became interested in due to their shared fascination with death
* Started a social media account to interact with others like him, leading him to found what would become known as the suicide cult "Hare's Nest" 		2428
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20527746414481422221453541After a year, he switched his profession from public prosecutor to lawyer, then took on several cases that earned him notoriety241936Started elementary school6172728212221242326252017212529
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205378474245824323224636422520377* Megumu Kirihara disappeared, with Nozomu searching for him ever since
* Nozomu is at least 18 when he comes upon his brother's videos and sees the video of Megumu slashing Towa's collarbone, because this is specified to be after his brother disappeared		18Disappeared, then committed suicide not long after, for reasons unknown2829222322252427262118222630
90
20547948434683442423473743Narrowed down his sister's location to Shinkoumi and moved there, then gained favor with the Takasato Group to acquire better access to the resources he would need in his investigation2621388193023242326252827Started working at Murase Clinic22Joined Hare's Nest and started acting oddly. Eventually, he got embroiled in a plot where Kimika (the leader of the group) kidnapped him and attempted to kill them both together, although Baku saved him in the nick of time19Started noticing Shiro's increasingly erratic behavior after his newfound association with Hare's Nest, and not long after, he narrowly rescued Shiro from a murder-suicide attempt by Kimika23After Hare's Nest gained more members, as well as notoriety, Kimika eventually set his sights on a double-suicide with Shiro; though his plans were thwarted and he was sentenced to two years in prison27Found out about Kimika's involvement with Hare's Nest and reported him to the authorities, leading to Kimika's trial and subsequent imprisonment31
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2055804944478445252448384427223992031242524Was assigned to Shinkoumi, infiltrating the city by making herself a debtor who needs to repay her debt by working as a hostess in Toono's hotel272629282320242832
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2056Died from a heart attack, with his death announced on the news on November 98150454885462625His debt to the Takasato Group had accumulated to 300 million yen, resulting in Rei (potentially) getting dragged into the matter due to either his father or Sakaki 49Returned to Shinkoumi in around late October to early November after learning of Ryuujirou's death, and has since been prowling the Deathmatch Area as a "ghost" while plotting to get even with the Takasato Group394528* Moved to Shinkoumi to find someone who could satisfy his urges (see a person's insides), reasoning that doing so in the mainland would be riskier
* Started working as a florist at the flower shop "Rose" 		23Moved (or moved back) to Shinkoumi to escape the backtalking he had been getting from his previous job at the mainland, and currently works part-time as a pediatrician in Takanokuchi Medical Office40Became acquainted with Asakura because he felt lonely due to his mother rarely being home, with no mention made of his father10Started leading a violent gang of Hapless Children; this gang would become notorious for their ambush-assaults, or what is more well-known as Assault Parties21322526252827302924Some time after Kimika's sentence ended, Shiro got attacked by a stranger due to being mistaken for 'euphoria'/Towa2125* Was released from jail and reconciled with his friends before resuming his job at Sara-ya
* Started dating Ruu some time after his release from prison		29Started dating Kimika some time after the latter's release from prison33
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If Maya was still alive, to which it's a good thing she isn't, she'd (probably) be 55 years oldIf Kaga was still alive, he'd (likely) be around 43 years oldIf Mei was still alive, she'd be 24 years oldIf Megumu Kirihara was still alive, he'd (likely) be around 31 years old
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