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Dokuta Yogano (屋業 独太, Yamino Dokuta), occasionally referred to as Yakuza B, is a minor character in AI: THE SOMNIUM FILES and AI: THE SOMNIUM FILES - nirvanA Initiative.

He is a member of the Kumakura Family, having worked under Rohan Kumakura and now Moma Kumakura. Perhaps due to the way he looks, he is often mistaken for a low-ranking member even though he is toward the top. He typically does office work. He has recently fallen in love and lost a lot of weight.

Design[]

Dokuta has a swept back hair style, the hair on the top is dyed blonde, and the hair on the lower side is black; wearing a pair of golden sunglasses on his thin face; he also wears a black blazer with red vertical stripes and a red shirt, a gold necklace on the neck; and wears black suit pants and brown leather shoes.

Personality[]

Dokuta is a hot-tempered person with a bad attitude towards strangers who break into the Kumakura Office. However, he enjoys playing the masochist in the family (presumably in the relationship with Hanayo Nasu) and hates domestic violence.

At the age of 48, he for some reason got infected with TC-PERGE and went insane. When he was infected with the virus, he liked to say words such as "iomante", "old man shamo" or "the sound of civilization".

Story[]


Life as a Yakuza and Doctor[]

At some point in time, at earliest around 2000, Dokuta was a member of the Kumakura Family under Rohan Kumakura's rule. Over time, Dokuta rose to be one of the top executives of the family, despite mostly doing paperwork at the office. Around the early 2010s, Dokuta and Chinpei Wagai assisted in and/or witnessed Rohan in torturing Hayato Yagyu for the murder of X. During that torture, Dokuta witnessed Rohan forcing Yagyu to join the Kumakura Family as an assassin.

By at least 2001, Dokuta worked as the local mob doctor in the Minato District, managing his own underground clinic; it is unclear but highly likely that his early employment as a mob doctor coincided with his affiliation with the Kumakura Family.

Around October 26th, 2001, Dokuta (24) was approached by a pregnant Manaka Iwai, who was looking to have her baby delivered off-the-record to prevent a scandal with the father, So Sejima. By the end of the 26th, Dokuta successfully delivered a baby girl to Manaka. However, soon after, Manaka was killed by Saito Sejima, and her body was buried by Rohan Kumakura and two unidentified yakuza. Manaka's friend, Hitomi Sagan, approached him with Manaka's baby, and Dokuta falsified a birth certificate for the baby with the name "Iris Sagan," with her birth mother marked as Hitomi.

Twelve years later, on August 2013, Dokuta (36) encountered Hitomi yet again when she brought in an injured Hayato Yagyu to his underground clinic. Hitomi had found Yagyu bleeding out at the nearby Ikume Shrine from a gunshot wound and brought him over to attend to his wound. Dokuta patched Yagyu up, although any known interaction between the two, or what Dokuta's thoughts on the matter were, are unknown.

Several months later, around November, Rohan approached the Kumakura Family, and specifically Yagyu, to inform them that they would be targeting and assassinating Hitomi Sagan and the now-12 year-old Iris Sagan. However, a few days later, Rohan Kumakura (or rather, Hayato Yagyu as a parasite inside Rohan's body) declared to the Kumakura family that the kill order on the Sagan family had been revoked. And after a few more days, Rohan (this time Saito Sejima as a parasite inside Rohan) was arrested for attempted murder on the Sagan family and declared clinically insane. Dokuta's opinion and feelings with these developments, notably with his prior connection to the Sagan family, are also unknown.

Under Moma, and with Hanayo[]

With Rohan arrested and hospitalized, his younger brother, Moma Kumakura, became the new chairman of the Kumakura Family. Rohan's iron grip on the family was loosened and the Kumakuras, Dokuta included, began pursuing legitimate and less violence venues of business and success.

During the years that followed, Dokuta encountered young nurse in her twenties named Hanayo Nasu. The circumstances with their first meeting are unknown —most likely related to their mutual employment in the medical field—, but despite their age difference, the two became close and began dating each other. With a love in his life, Dokuta began self-improving and losing weight, gaining a skinny physical appearance. By 2019, the pair were engaged and set to marry in early 2020.

Shoko Nadami's Murder[]

In late October of 2019, the entire Kumakura Family was invited to the Ujisaki Family Yearly Golf Tournament held outside the Central Tokyo area. By November 2nd, the tournament was over and the Kumakura family headed back to their offices.

Cyclops Serial Killings[]

On November 3rd, So Sejima visited the Kumakura Office to speak with Moma, most likely regarding a case of blackmail incurred at him regarding Manaka Iwai's body. Soon after, So hid in a back room as Special Agent Kaname Date arrived at the Office himself. Dokuta and Chinpei attempted to force him out, but the pair was knocked down to the floor. When Date attempted to check the room in the back, Chinpei retaliated by shooting at him, and when that didn't work, Dokuta brought out a machine gun. With Aiba's help, Date managed to incapacitate the two of them completely, and discovered So hiding in the back.

Two days later, on November 5th, Date approached the Kumakuras once again, this time requiring assistance with identifying the New Cyclops Killer. Moma ordered Dokuta and Chinpei to recover the cigarette buds they threw in the trash. Date determined which bud was So's and swiftly left to examine it for DNA.

Disappearance of Renju Okiura[]

On November 3rd, Special Agent Kaname Date arrived at the Office to interrogate the Kumakuras. Dokuta and Chinpei attempted to force him out, but the pair was knocked down to the floor. When Date discovered that Moma was a fan of Tesa, Moma forced Dokuta and Chinpei to step out of the office while they talked in private.

For the rest of the day and the next, Moma sent out Dokuta, Chinpei, and the other Kumakura members to find information on Renju's whereabouts throughout the city. On November 5th, Moma forced them to leave the office again once Date informed him that he would bring Iris to the office.

A-set fan and marriage[]

By 2020, following the closure of the New Cyclops Serial Killings, Moma turned Dokuta and the other members of the Kumakura Family into A-set fans. They attended a live performance by A-set in January, and in February they welcomed a post-surgery Iris to their office. During their visit, Date and Iris learned of Dokuta's other profession as a mob doctor, and of his engagement to Hanayo Nasu, set to marry the following month. Later that day, Dokuta joined the others in a group dance together at the Harbor Warehouse District.

Presumably by March 2020 in the Resolution Timeline, Dokuta and Hanayo married. However, in the Alpha Timeline, it is implied that they're still not married by April 2020.[1]

Divorce and TC-PERGE infection[]

What happened after Dokuta and Hanayo's marriage is unknown. However, one day after five years of their marriage, the two divorced.

After the divorce, Dokuta Yogano was infected with TC-PERGE for some reason one day, went insane and became one of the missing persons registered at that time.


On February 13, 2026, he broke into Lemniscate Entertainment Offices and sat shaking his head on a sofa in the hall. After Mizuki Date entered the hall, Dokuta was attracted by the conversation between her as the boss and Iris Sagan and Ota Matsushita. He immediately got up and walked in front of Mizuki, told her if she had watched the Nirvana Trial video, and told "practice run will be done on the rooftop of Misetan," then he left.

Two days later, the Nirvana Initiative was thwarted. When Mizuki Date and Bibi came to the Kumakura Office on February 22, Moma Kumakura told them that Dokuta was receiving treatment now.

Appearances[]

AI: THE SOMNIUM FILES
Day 1: sigAI
Absent
BRaiN
Absent
Day 2: saikAI
Absent
PaiN
Absent
Day 2: meikAI Day 2: keitAI
Absent Absent
Day 3: syokubAI Day 3: gyoukAI
Appears Appears
VaiN VILLaiN
Absent Absent
Day 3: rihAI Day 3: gumAI Day 3: kyuusAI
Absent Absent Absent
Day 4: youdAI Day 4: jukkAI Day 4: syuurAI
Absent Flashback Mentioned
SWaiN CURTaiN MaiN: 1
Absent Absent Absent
Day 4: jikAI Day 4: syougAI Day 4: kikAI Day 4: irAI Day 5: kenzAI
Absent Absent Absent Absent Absent
Day 5: zugAI Day 5: seisAI Day 5: jinnAI Day 5: dakkAI Day 5: jutAI
Absent Appears Absent Mentioned Absent
SUSTaiN REFRaiN MaiN: 2 MOUNTaiN
Absent Absent Absent Absent
Day 5: syokuzAI Day 5: ihAI Day 6: kekkAI Day 5: kokkAI
Absent Absent Absent Mentioned
Ota: END Day 6: hiAI Annihilation: END Iris: END Day 6: sousAI
Absent Absent
CAPTaiN CHaiN
Absent Absent
Day 6: sanpAI Day 6: hakAI
Absent Absent
Mizuki: END Three Months Later: kassAI
Appears
Resolution: END
AI: THE SOMNIUM FILES - nirvanA Initiative
6 Years Ago Present
Converge Ch 0:
A Strange Tale (Past)

Absent
Converge Ch 0:
A Strange Tale (Present)

Absent
Mizuki Ch 0:
New Investigation

Absent
Ryuki Ch 0:
Dispossessed

Absent
Mizuki Ch 0:
Alone

Absent
Ryuki Ch 1:
Anyone Imagines

Absent
Mizuki Ch 1:
Pass Mildly Away

Absent
Ryuki Ch 1:
Nefarious Institute

Absent
Mizuki Ch 1:
Nostalgic Idol

Absent
Ryuki Diverge:
遐エ邯サ逋セ蜃コ

Absent
Ryuki Ch 1:
Ought to Know

Absent
Mizuki Ch 1:
End Where I Begun

Absent
Mizuki Ch 2:
Traveler

Absent
Ryuki Ch 2:
Nothing to Be Done

Absent
Mizuki Ch 2:
Necessary Intervention

Absent
Ryuki Ch 2:
Naixatloz's Intentions

Absent
Mizuki Ch 2:
Left Behind

Absent
Ryuki Ch 2:
Go

Absent
Ryuki Ch 3:
Farewell

Absent
Mizuki Ch 3:
The Expense of Spirit

Appears
Ryuki Ch 3:
Need Info

Absent
Mizuki Ch 3:
Neurotic Inception

Absent
Ryuki Ch 3 R2:
Joy for Anguish

Absent
Ryuki Ch 3 R1:
Smiles for Tears

Absent
Mizuki Ch 3 M1:
Hell

Flashback
Mizuki Ch 3 M2:
All Living Things

Absent
Ryuki Ch 4 R2:
I Found Me

Absent
Mizuki Ch 4 M1:
Visions

Absent
Ryuki Ch 4 R1:
Well-Known

Absent
Mizuki Ch 4 M2:
Of Arms and Of Man

Absent
Ryuki Ch 4 R2:
Nested Insecurities

Absent
Mizuki Ch 4 M1:
Nonentity Incognito

Absent
Ryuki Ch 4 R1:
Nearly Interesting

Absent
Mizuki Ch 4 M2:
Novel Ingress

Absent
Ryuki Ch 4 R2:
Past Its Ken

Absent
Mizuki Ch 4 M1:
In Truth

Absent
Ryuki Ch 4 R1:
The Mind of God

Absent
Mizuki Ch 4 M2:
Who's There

Absent
Mizuki Ch 4 M3:
Bid the Soldiers Shoot

Absent
Komeji and Shoma: END Ryuki Ch 5 R1:
Not All A Dream

Absent
Mizuki Ch 5 M1:
Births

Absent
Mizuki Ch 5 M2:
All That We Are

Absent
Mizuki Ch 5 M3:
Sweet Silent Thought

Absent
Ryuki Ch 5 R1:
Nemesis Identified

Absent
Mizuki Ch 5 M1:
Nightmare Irreconcilable

Absent
Gen and Amame: END Kizuna and Lien: END
Ryuki Ch 5 R1:
She Was the Universe

Absent
Mizuki Ch 5 M1:
The End of Craving

Absent
Ryuki Diverge:
All This Happened, More or Less

Absent
Explosion: END Mizuki Epilogue:
Braver Than All Flowers

Mentioned
閭。陜カ荵句、「邱ィEND
Resolution: END

Gallery[]

Trivia[]

Etymology[]

  • The name Dokuta comes from the word "Doctor" written in kana. His family name 屋業 is "Yamino", and when combined with Dokuta it becomes "Yami no dokuta" which stands for "underground/illegal doctor," referencing his profession as a mob doctor.
  • Dokuta and his fiancée, Hanayo Nasu, are the only two characters whose names were changed in localization (or rather, the way their kanji are read is changed in localization). In Dokuta's case, his family named was originally read and pronounced as "Yamino" in the Japanese version, which was changed to "Yogano" in the English localization.

General[]

  • Dokuta's "Likes" list the term "dominatrixes," while his fiancé's, Hanayo Nasu, has "candles, ropes, and rodeos" for her "Likes." This heavily implies that the two of these have a BDSM relationship, with Hanayo as the dominant figure and Dokuta as the submissive figure.
  • In the Alpha Timeline from the Lemniscate YouTube series, it stated that Dokuta and Hanayo were still not married by April 2020, but that they would be soon. One possibility for the delay in dates (outside of simply being on a different timeline), is due to the COVID-19 epidemic that broke out to the whole world by March of 2020, as the quarantine for the virus has been alluded to in within the Lemniscate series.[1]

Navigation[]

AI: THE SOMNIUM FILES
Media
AI: THE SOMNIUM FILESAI: THE SOMNIUM FILES DEMORaiNBOW AFFaiR Complete SoundtrackREVERIES IN THE RaiN SoundtrackTHOUGHTS REMaiN BELOW Artbook
Characters
Kaname DateAibaIris Sagan/A-setOta MatsushitaMizuki OkiuraBossPewterNew Cyclops Killer
Hitomi SaganMayumi MatsushitaRenju OkiuraMamaShoko NadamiSo SejimaMoma KumakuraRohan KumakuraCyclops Serial Killer
#89FalcoBodyguardsTakero MatsushitaManaka IwaiSaito SejimaYakuza AYakuza BNurseReceptionistMermaidTaxi DriverInspector
Locations
Tokyo
Chiyoda District: Police Headquarters (Boss's Office; Psync Room; Interrogation Room) • Sunfish Pocket
Koto District: Harbor Warehouse District (Cold Storage Warehouse) • Date Residence
Meguro District: Sagan ResidenceTiefblau
Minato District: Sejima ResidenceKumakura OfficeIkume ShrineLemniscateCentral Hospital
Near Kabasaki District: Bloom ParkOld Chemical PlantMatsushita Diner
Shinjuku District: Golden Yokocho (Marble)
Other: Fuchu City (Fuchu Prison) • Akikawa ValleyOkutama MountainsEitoku High
Somnia
SINKIN' IN THE BRaiN (Spoiler) • PSYNCIN' IN THE PaiN (Spoiler)
PSYNCIN' IN THE VaiN (Spoiler) • PSYNCIN' IN THE SWaiN (Spoiler)
PSYNCIN' IN THE SUSTaiN (Spoiler) • PSYNCIN' IN THE CAPTaiN (Spoiler)
PSYNCIN' IN THE CURTaiN (Spoiler) • PSYNCIN' IN THE REFRaiN (Spoiler)
PSYNCIN' IN THE VILLaiN (Spoiler) • PSYNCIN' IN THE MaiN: 1 (Spoiler)
PSYNCIN' IN THE MaiN: 2 (Spoiler)
PSYNCIN' IN THE MOUNTaiN (Spoiler) • PSYNCIN' IN THE CHaiN (Spoiler)
Chapters
Red Route: sigAIsaikAImeikAIsyokubAIrihAI
youdAIjikAIzugAIsyokuzAI
Yellow Route: syougAIseisAIhiAIsanpAI
Green Route: gumAIjukkAIkikAIjinnAIihAI
Purple Route: keitAIgyoukAIkyuusAIsyuurAIirAIdakkAIkekkAI
Pink Route: kenzAIjutAIkokkAIsousAIhakAIkassAI
Organizations
Tokyo Metropolitan Police Department (Advanced Brain Investigation Squad) • Ujisaki Family (Kumakura FamilyKumakura Estates) • Secret Society NAIXATLOZForeign Mercenaries
LemniscateSunfish PocketMarbleTiefblauFamiSto8-12Elgorg
Items
Wadjet SystemEvolverLight Synaptic Nerve Connection DeviceDate's CarShovelForgeOdoroki-man ChocolateGeostationary Satellite X00639
Events
Chemical Plant ExplosionOriginal Cyclops Serial KillingsBreak-In at Sagan ResidenceNew Cyclops Serial KillingsIncident at Minato District HighwayDisappearance of Renju OkiuraOperation: Iris Rescue
Full List of Events
AI: THE SOMNIUM FILES - nirvanA Initiative
Media
AI: THE SOMNIUM FILES - nirvanA InitiativeHARMOniOUS DISCORD SoundtrackSECRET OF THE WORLD: THE DEFIniTIVE ART BOOK
Characters
Mizuki DateAibaKuruto RyukiTamaMasked Woman (True Identity) • Amame DoiGen IshiyaganeKizuna ChiedaLien TwiningAndes KomejiShoma EndaTokiko ShigureTearerKaname Date
Chikara HoradoriBossPewterMamaIris SaganOta MatsushitaMoma KumakuraJin FurueRiichi Chieda
So SejimaHitomi SaganUru SomezukiMarcoDetectiveInspectorMamoru BodaiNurseChinpei WagaiDokuta YoganoReceptionistTaxi DriverHoradori ResearchersNaix MembersForeign MercenariesPolicemenSpecial Assault Team
Locations
Tokyo

Chiyoda District: Police Headquarters (Boss's Office, Psync Room, Interrogation Room) • Sunfish PocketSekiba High
Chuo District: Horadori Institute of Genetics (Underground, Hostage Room) • Naixatloz Japan Branch (President's Office, Cathedral)
Koto District: Harbor Warehouse DistrictDate Residence
Minato District: Studio DvaitaAioen OrphanageIkume ShrineKumakura OfficeSejima ResidenceCentral Hospital
Shibuya District: Lemniscate Entertainment OfficesYoyagi Park
Shinagawa/Kabasaki District: Matsushita DinerSagan ResidenceEnda ResidenceKabasaki Chemical Plant
Shinjuku District: Golden Yokocho (Marble, Brahman World Cuisine) • Misetan Department StoreTokyo National Stadium

Somnia
New Investigation (Spoiler)
Nefarious Institute (Spoiler) • Naixatloz's Intentions (Spoiler)
Need Info (Spoiler) • Nested Insecurities (Spoiler)
Nearly Interesting (Spoiler) • Nemesis Identified (Spoiler)
Nostalgic Idol (Spoiler) • Necessary Intervention (Spoiler)
Neurotic Inception (Spoiler) • Nonentity Incognito (Spoiler)
Novel Ingress (Spoiler) • Nightmare Irreconcilable (Spoiler)
Chapters
Converge Chapter: A Strange Tale

Side Ryuki:
DispossessedAnyone ImaginesOught to KnowNothing to Be DoneGoFarewell
Komeji and Shoma Route: Joy for AnguishI Found MePast Its Ken
Explosion Route: Smiles for TearsWell-KnownThe Mind of GodNot All A DreamShe Was the Universe
閭。陜カ荵句、「邱ィ Route: 遐エ邯サ逋セ蜃コAll This Happened, More or Less
Side Mizuki:
AlonePass Mildly AwayEnd Where I BegunTravelerLeft BehindThe Expense of Spirit
Gen and Amame Route: All Living ThingsOf Arms and Of ManWho's ThereAll That We Are
Kizuna and Lien Route: Bid the Soldiers ShootSweet Silent Thought
Resolution Route: HellVisionsIn TruthBirthsThe End of CravingBraver Than All Flowers

Organizations
Tokyo Metropolitan Police Department (Advanced Brain Investigation Squad) • AMABIE-TVChieda FamilyHoradori Institute of GeneticsNaixatlozOrder of %
Items
Psync MachineWadjet System • Mizuki's enhanced pipe • EvolverEvolver MC
Bats490Fray to FreeNirvana TrialNirvana XTC-PERGE
Mizuki's ScooterRyuki's Limousine
RobotaRoboji
Events
Half Body Serial KillingsNirvana Initiative
Full List of Events

References[]

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