AI: The Somnium Files Wiki
AI: The Somnium Files Wiki

"Dreams are a collage of many memories intertwining and blending with each other. Isn't it incredible?"
—Pewter, in the AI: THE SOMNIUM FILES Character trailer

Futa Amanoma (天乃間 風太, Amanoma Fūta), also known as Pewter (ピュータ, Pyūta), is a main character in AI: THE SOMNIUM FILES, and a character featured in AI: THE SOMNIUM FILES - nirvanA Initiative and the Lemniscate YouTube series.

He is the engineer of the Tokyo Metropolitan Police Department's Advanced Brain Investigation Squad (ABIS), working under Boss. He also works alongside Kaname Date and Aiba. He is the inventor of the Psync system.


Pewter is 36 years old and stands at 186 cm tall. He has short gray hair, no eyebrows, and wears a translucent green visor over his eyes. He wears a full gray bodysuit and matching shoes with angular accents in different shades of gray. On top, he wears a stylized lab coat with green lining, featuring a tall popped collar and large folded cuffs. The belt at his waist holds a tablet device of some kind. He also wears a silver wristwatch and shoes that match his bodysuit.


Among his coworkers, Pewter carries himself with a calm and professional demeanor. He is passionate about his work on Aiba and the Psync System, and will readily explain their functionality when asked. Despite his studious attitude, he does sometimes complain about Boss and Date heaping extra work on him, and has a unique sense of humor. Pewter also cares deeply about his loved ones, and is willing to go behind Boss's back for their sake if he feels he must.

Much like Date and Boss, Pewter has a perverted side, and discreetly stashes his pornography in his office much like Boss does.


Early Life

Futa Amanoma was born February 1st, 1983.

As an adult, he adopted the nickname "Pewter" and began working at the Tokyo MPD's ABIS. There, he was an engineer working under Boss, and used the Wadjet System to create the Psync System. The Psync system allowed a Psyncer to dive into a subject's dream to search for clues. The system also had a top-secret function that would allow the Psyncer and subject to swap bodies by exceeding the machine's time limit. At some point, the Chiba police department began working on a prototype.

Cyclops Serial Killings

In October 2013, the bodies of several women were discovered in Akikawa Valley, having been killed between May and September. Each of the victims had their right eye removed posthumously, and the case was dubbed the Cyclops Serial Killings after the media received a letter from the self-proclaimed "Cyclops."

Around the same time, Boss's old friend Hayato Yagyu came to her for help: he had been working as an assassin under Rohan Kumakura, and had been instructed to kill his girlfriend and her daughter before quitting. Boss proposed using the Psync machine to swap bodies with Rohan, thus starting a new life and pinning all his old crimes on his former body. Yagyu agreed, and Pewter assisted with the Psync.

In Rohan's Somnium, Pewter and the others witnessed the Cyclops killings, and realized that the Cyclops Killer was actually a duo of Saito Sejima, who committed the murders, and Rohan, who removed the eyeball. However, before they could hold Rohan (now in Yagyu's body), a policeman on site let him leave.

After Rohan was arrested and sent to Fuchu Prison as #89, Pewter and Boss sent Yagyu (now in Rohan's body) to speak with Saito to investigate the Cyclops Killings. However, they lost communication with him for a week, until Boss discovered him wandering Golden Yokocho in Saito's body, missing his left eye and his memories.

The full details of the case were later classified. In the years that followed, the MPD received reliable intel that the prototype Psync machine had been scrapped and its pieces sold on the black market overseas.

Advanced Brain Investigation Squad

Boss gave Yagyu the name Kaname Date and hired him as a Psyncer at ABIS, where he worked with Pewter to solve cases using the Psync system. On November 9th, 2014, Pewter used the Wadjet System to create Aiba for Date, an artificial intelligence that would live in his artificial left eye. Not only could Aiba assist Date in the field, she would also regularly administer oxytocin, which Saito's brain could not produce regularly.

Some time after Renju Okiura's divorce with Shoko Nadami in 2015, he and Pewter began dating. On an anniversary, Pewter gave Renju a gold wristwatch as a gift.

In 2018, Pewter learned of Rohan Kumakura's suicide, who he believed to be Saito Sejima at the time.

Prior to the New Cyclops Serial Killings, Pewter installed a few new features to the Psync System, including a function that would slow down time while the Psyncer remained immobile, and special objects that could alter the amount of time necessary to perform an action.

Murder of Shoko Nadami

On November 1st, 2019, Shoko Nadami's body was discovered on a merry-go-round in Bloom Park, with her left eye removed. At the scene, Kaname Date discovered Renju's daughter Mizuki Okiura holding the apparent murder weapon. She was unable to speak due to her trauma, so Boss had her brought to ABIS the following day in the hopes of Psyncing with her, both to help her speak again as well as search for evidence about what she witnessed. Pewter operated the Psync machine, guiding Date through the process and monitoring Mizuki's condition.

A: New Cyclops Serial Killings

In Mizuki's Somnium, Pewter and the others witnessed a mysterious figure appear at the edge of the Bloom Park merry-go-round. After the Psync, Mizuki's aphonia was healed, and she returned to the Psync control room to discuss the case. Date and Boss asked her a number of questions about what happened, and Date also asked Pewter about the mechanics of Somnium. Pewter explained that dreams were created from memories, and thus the figure would not have appeared if Mizuki had not seen it. He also explained that Aiba was able to appear in Somnium since she was linked to Date's brain, and a part of her transferred into Somnium as well. After the discussion, Date left with Mizuki to investigate Bloom Park again.

That night, Date and Mizuki discovered Renju's body at Sunfish Pocket with his left eye removed. The morning of the 3rd, Pewter and the other members of ABIS met in Boss's office to discuss the case. Pewter, crushed by the news of Renju's death, insisted that Date should know the truth of the Original Cyclops Serial Killings. Pewter and Boss explained only the publicly available details of the case, and pointed out that the profile of the victims did not match: the original victims were women with their right eyes removed posthumously, while the new victims included men and had their left eyes removed before death. Date was convinced there was a connection and frustrated that the rest of the case was a national secret, but Pewter could explain no further. Date left for Sunfish Pocket to investigate.

Date returned to ABIS with Iris Sagan (actually Saito Sejima) in tow to interrogate her. After learning that she was hiding something, Boss encouraged Date to Psync with her, so Pewter assisted with the process.

AA: Investigation of the Bloody Polar Bear

Inside "Iris's" Somnium, Pewter and others witnessed a figure kissing congressman So Sejima. Back in the Psync Room, Pewter, Date, and Boss tried to make sense of the Somnium, and concluded that it was unclear whether Iris and So were acquainted, as he was a public figure she could have seen on TV. Date went to question Iris again, and eventually left for Matsushita Diner.

Around 3:00 AM on the 4th, a livestream began from the Okiura Fishery Cold Storage Warehouse of Iris's body with her left eye removed, as someone in a polar bear costume prepared to cut her with the blade of an ice cutting machine. Thanks to Date's timely arrival, Iris and Ota Matsushita were saved. Date would later return to ABIS in the evening to Psync with Ota with Pewter's assistance.

AAA: Confession from Mayumi Matsushita

In Ota's Somnium, Pewter and the others witnessed the polar bear wield Mayumi Matsushita's floral kitchen knife, and Date left to speak with her. He brought her back to ABIS for questioning the following morning, but Pewter explained that the Psync machine was still inoperable. Date and Ota had not been very compatible, and he had to push the machine harder to get it working. Boss gave him six hours to fix the machine (much to Pewter's distress), and Date left to investigate and planned to return to Psync with Mayumi later.

That afternoon, Pewter called Date to let him know the Psync machine was up and running again. Date informed him that he had just found So Sejima's body with the left eye hollowed out, and that he would return to ABIS. Back at ABIS, Date caught Pewter up on the details of the case, and Pewter assisted Date in Psyncing with Mayumi.

AAB: Search for the Injured Culprit


AB: Interrogation of #89


B: Assisting Renju Okiura


BA: Kidnapping of Iris Sagan


BB: Discovery of Manaka Iwai



Day 1: sigAI
Day 2: saikAI
Voice Only
Day 2: meikAI Day 2: keitAI
Appears Appears
Day 3: syokubAI Day 3: gyoukAI
Appears Appears
Absent Absent
Day 3: rihAI Day 3: gumAI Day 3: kyuusAI
Appears Appears Appears
Day 4: youdAI Day 4: jukkAI Day 4: syuurAI
Appears Appears Appears
SWaiN CURTaiN MaiN: 1
Voice Only Voice Only Absent
Day 4: jikAI Day 4: syougAI Day 4: kikAI Day 4: irAI Day 5: kenzAI
Absent Appears Appears Absent Absent
Day 5: zugAI Day 5: seisAI Day 5: jinnAI Day 5: dakkAI Day 5: jutAI
Appears Appears Appears Appears Appears
Voice Only Voice Only Absent Absent
Day 5: syokuzAI Day 5: ihAI Day 6: kekkAI Day 5: kokkAI
Absent Appears Absent Appears
Ota: END Day 6: hiAI Annihilation: END Iris: END Day 6: sousAI
Absent Mentioned
Voice Only Absent
Day 6: sanpAI Day 6: hakAI
Appears Flashback
Mizuki: END Three Months Later: kassAI
Resolution: END




  • The nickname Pewter (ピュータ) has various meanings:
    • It is short for "computer" (コンピューター). This is fits his work with computers, AI, and the Psync System.
    • It is also the name of a shade of gray, matching his hair color and clothing.
    • It is pronounced similarly to the Hindu word for "putalee", which stands for "pupil" or "eye".[1]
    • "Pyuu pyuu" is onomatopoeia for blowing wind (風), the first kanji in Futa.


  • Out of the 6 humans in the main cast, Pewter is the only one who doesn't die in any route or ending. Even Mizuki Okiura, while never killed on-screen, has an unknown fate in the Mizuki Bad END, as she is most likely killed by Saito Sejima soon after.
  • Pewter is one of the few confirmed LGBT+ characters featured in the game, alongside Renju Okiura and Mama.
  • Pewter mentions his sister in JP.jpeg
    In the Japanese version of the game, Pewter mentions that he has a younger sister. On Day 4: Monday -syuurAI-, during the investigation segment in Boss's Office at 4:06 PM, when inspecting the Air Conditioner (エアコン, lit. aircon), Pewter sighs and Date jokes that the "siscon" is blowing out air. Pewter responds with "Well I certainly do have a younger sister, but I can definitely say I don't have a sister complex."[2]
  • In a fan-made Character Poll for AI: THE SOMNIUM FILES held on Twitter, Pewter came in 9th place, tying with Hitomi Sagan.[3]
  • When asked by a fan to release Pewter from prison, Kotaro Uchikoshi stated "He is not in a jail..." This could either be a reference to Pewter's status within the continuity of the Lemniscate YouTube series, or a reference to his status in AI: THE SOMNIUM FILES - nirvanA Initiative, as he remains a supporting member of ABIS in that game.[4]
  • When asked if a parallel world where Pewter and Renju "get their happy ending together" would ever be shown, Kotaro Uchikoshi stated that it could be possible if the fans demanded it.[5] He also encouraged fans to create their own fantasy version of this parallel world, specifically praising a parallel world where they lived a domestic life, making morning coffee, waking up with messy hair, and in which Renju is "a bottom."[6]


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
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
SINKIN' IN THE BRaiN (Spoiler) • PSYNCIN' IN THE PaiN (Spoiler)
PSYNCIN' IN THE VaiN (Spoiler) • PSYNCIN' IN THE SWaiN (Spoiler)
PSYNCIN' IN THE VILLaiN (Spoiler) • PSYNCIN' IN THE MaiN: 1 (Spoiler)
PSYNCIN' IN THE MaiN: 2 (Spoiler)
Red Route: sigAIsaikAImeikAIsyokubAIrihAI
Yellow Route: syougAIseisAIhiAIsanpAI
Green Route: gumAIjukkAIkikAIjinnAIihAI
Purple Route: keitAIgyoukAIkyuusAIsyuurAIirAIdakkAIkekkAI
Pink Route: kenzAIjutAIkokkAIsousAIhakAIkassAI
Tokyo Metropolitan Police Department (Advanced Brain Investigation Squad) • Ujisaki Family (Kumakura FamilyKumakura Estates) • Secret Society NAIXATLOZForeign Mercenaries
LemniscateSunfish PocketMarbleTiefblauFamiSto8-12Elgorg
Wadjet SystemEvolverLight Synaptic Nerve Connection DeviceDate's CarShovelForgeOdoroki-man ChocolateGeostationary Satellite X00639
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
Lemniscate YouTube Series
Lemniscate (channel)To-Witter Archives 2019 (Tesa)To-Witter Archives 2020 (Tesa)

To-Witter Archives Aseton: Main PageAseton Plays DanganronpaRevisiting the YouTube seriesTokyo Game Show & AI Launch DayAseton Zero EscapeAseton Terraria PioneerCrypt of AsetonAseton of HyruleIndivisible Aseton
Weibo Archives
A-set To-Witter (English)A-set To-Witter (Japanese)a_set_on Weibo (Chinese)Mato To-WitterKotaro Uchikoshi Eng To-WitterFluerichaji To-Witter

Love Songs From Another WorldVirtuoso of the Space Time Continuum
A-set (impostor) • Ota MatsushitaMizuki OkiuraKotaro UchikoshiFluerichajiWhite Horse WomanBloody Polar Bear
Renju OkiuraHitomi SaganMayumi MatsushitaMama****** ****AibaBossPewterYūsuke KozakiAkira OkadaCyclopsAmame DoiHorusBastet • "Uncle" • Missing Girl • Missing Girl's Parents
Tokyo: Sagan ResidenceLemniscate OfficeSunfish PocketKabasaki DistrictBloom Park (Somnium) • Old Chemical PlantMatsushita DinerIkume ShrineGolden Yokocho (Marble) • Harbor Warehouse District (Okiura Fishery Cold Storage Warehouse) • Sejima ResidencePolice Headquarters (Boss's Office/Psync Room) • Okutama Mountains
USA: San FranciscoCalifornia
LemniscateSpike ChunsoftSecret Society NAIXATLOZGame Developers ConferenceSunfish PocketMarbleTokyo Metropolitan Police Department (Advanced Brain Investigation Squad) • Anime Expo
A-set's video seriesCyclops Serial KillingsChemical Plant ExplosionDisappearance at Bloom ParkA-set's campaign against NAIXATLOZSpike Chunsoft's panel at GDC Disappearance of Iris SaganImpersonation of Iris SaganIris Sagan's playthrough of AI: THE SOMNIUM FILESVisit to the Somnium Files DiscordSpike Chunsoft's panel at Anime Expo 2019
Videos (Pre-release)
0: Uchikoshi Introduces Net Idol A-set! (Invincible Rainbow Arrow)
1: Tesa's Top 3 Favorite Snacks and Mascots!
2: Tesa Visits Maid Cafe Sunfish Pocket!
3: There's No Way This Trespassing Idol Can Be This Cute!
4: Tesa's Matsushita Diner Review! Omelet Rice Edition!
5: A-set Reservations Unknown
fAInal: rw nw prt m hrw
A-set's GDC All-Access Convention Report!
Sneaking Into ABIS!
Exploring a Dreamworld!
This Is Your Idol
7: Zanki Zero Let's Play! Can Tesa Survive the Ruins?! (Alt)
8: It’s time to talk about the Cyclops Case (might lose subscribers for this...)
9: My 10-Day Vacation Diary
10: AI: THE SOMNIUM FILES Let's Play! Detective Tesa!
11: That Time I Got Forced To Do Impressions by an Egyptian God
12: Tesa's Spirited Away Adventure: Picture Book Edition!
13: Tesa Answers Over 30 Questions at Super Speed!
14: "Invincible Rainbow Arrow" Dance feat. Mizuki, Ota, and...White Horse Woman?!
15: Sneak Peek at AI: THE SOMNIUM FILES LE/Day One Edition!
16: You Won't Believe the Friend I Just Made! (Secret video)
17: Graduation (AX Panel)
Videos (Post-release)
18: A-set's AI: THE SOMNIUM FILES Exclusive Launch Day Let's Play
19: AI: THE SOMNIUM FILES Let's Play Part 2! Ota is here!!!
AI: THE SOMNIUM FILES - nirvanA Initiative
Protagonists: Mizuki DateAibaKuruto RyukiTama

Main Characters: Iris SaganKizuna ChiedaAndes KomejiAmame DoiGen IshiyaganeShoma EndaLien TwiningKaname DateMasked WomanTearer
Supporting Characters: Chikara HoradoriTokiko ShigureBossPewterOta MatsushitaHitomi SaganMoma KumakuraMama
Minor Characters: Jin FurueRiichi ChiedaSo SejimaAraya KagamiMikoto UshideraChinpei WagaiDokuta YoganoRitsuko EnshuMamoru BodaiHanayo NasuTakushi IbaradoMarco


Chiyoda District: Police Headquarters (Boss's Office, Psync Room, Interrogation Room) • Sunfish Pocket
Chuo District: Horadori Institute of GeneticsNaixatloz Japan Branch
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) • Sekiba HighTokyo National Stadium

New InvestigationNefarious InstituteNaixatloz's IntentionsNeed InfoNested InsecuritesNearly InterestingNemesis IdentifiedNostalgic IdolNecessary InterventionNeurotic InceptionNonentity IncognitoNovel IngressNightmare Irreconcilable
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

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