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The Sejima Residence is a location featured in AI: THE SOMNIUM FILES, AI: THE SOMNIUM FILES - nirvanA Initiative and the Lemniscate YouTube series. It is the real world counterpart to the Somnium world Nemesis Identified.

It is a "-zukuri"-styled mansion located in Azabu, Minato District. So Sejima lives here, along with his countless amount of bodyguards. His wife lived here until she passed away, and his son Saito lived there until his young adult years.

Story[]

Sejima Residence was bought by So Sejima at around 1999, when he was 40 years old, after he moved from Kabasaki District.[1] He lived here for almost two decades.


Since at least 2013, the mansion has been staffed by multiple bodyguards and maid(s). So's son, Saito Sejima, also lived here until one day in 2013. People have since been told "he traveled overseas."

After the New Cyclops Serial Killings case was resolved, these bodyguards basically left their jobs. So Sejima, who ended his political career due to the exposure of his son Saito Sejima's case, intends to move away from this mansion in the future and live on a foreign island in his remaining life.


However, he actually stayed here after he resigned as Congressman, and three months later welcomed a strange visitor who called himself Tearer. Besides that, So Sejima often invites Iris Sagan - actually his illegitimate daughter - to visit his mansion from time to time.

It was another six years before So Sejima moved out of the mansion, and the mansion's subsequent fate is unknown.

Item Dialogue (AITSF)[]

Outside[]

Mansion[]

  • Default dialogue:
    1. The Sejima residence.
  • Day 5: dakkAI, during the free move investigation segment:
    1. The Sejima residence.
      Aibear icon Aiba: (No one is inside.)
    2. If no one is inside, then...)

Tree[]

  • Default dialogue:
    1. A tree.

Stone[]

  • Default dialogue:
    1. A garden stone.
  • Day 5: dakkAI, during the free move investigation segment:
    1. A garden stone.
      Where's the life signal coming from...?

Topiary[]

  • Default dialogue:
    1. A topiary.
  • Day 4: youdAI, during the free move investigation segment:
    1. That's a big moss ball.
      No, actually... it's a well-manicured tree.
      He must be into topiary.
    2. It's not a big moss ball.
  • Day 3: gyoukAI, during the 7:54 PM investigation segment:
    1. That's a big kabosu.
      No, wait. That's a bush.
      It's a nice bush.
    2. Not a kabosu.
  • Day 4: syuurAI, during the free move investigation segment:
    1. That's a big, green mochi.
      Actually, now that I look closer, it's just a bush.
      A spherical bush.
    2. Not a mochi.
  • Day 5: dakkAI, during the free move investigation segment:
    1. A giant, green blob. If four connect, they disappear.
      Oh, never mind. That's a plant.
      It's a plant.
    2. Not a blob.

Lantern[]

  • Default dialogue:
    1. A garden lantern.
  • Day 4: youdAI, during the free move investigation segment:
    1. A garden lantern.
      Aibear icon Aiba: (Hm? Well, that is strange...)
      Aibear icon Aiba: (Why is Reika from the cabaret club over there?)
      Date icon Date: (That's a lantern! It doesn't look anything like her!)
    2. There's a garden lantern.
  • Day 3: gyoukAI, during the 7:54 PM investigation segment:
    1. Aibear icon Aiba: (Look, Date. Your favorite cabaret girl is here.)
      Date icon Date: (That's just a lantern!)
      Date icon Date: (Reika isn't that sturdy!)
  • Day 4: syuurAI, during the free move investigation segment:
    1. A garden lantern.
      Aibear icon Aiba: (Speaking of gardens, what kind do you prefer?)
      Date icon Date: (I like a well-manicured lawn.)
      Aibear icon Aiba: (...)
      Date icon Date: (But some bushes aren't bad either...)
      Aibear icon Aiba: (...)
      Date icon Date: (I mean, what?)
    2. There's a garden lantern.
  • Day 5: dakkAI, during the free move investigation segment:
    1. Aibear icon Aiba: (It's a garden lantern.)
      Aibear icon Aiba: (I said "garden lantern," not "harden lanyard.")
      Date icon Date: (I'm aware of that!)
    2. There's a garden lantern.
      No one here.

Bridge[]

  • Default dialogue:
    1. There's an arch-shaped stone bridge over the pond.
  • Day 5: dakkAI, during the free move investigation segment:
    1. There's an arch-shaped stone bridge over the pond.
      Date icon Date: (Is that Mr. Bridges?)
      Aibear icon Aiba: (Who?)
    2. There's no one on the bridge.

Pond[]

  • Default dialogue:
    1. A pond.
  • Day 4: youdAI, during the free move investigation segment:
    1. A pond.
      Date icon Date: (Look, Aiba. A giant salamander.)
      Aibear icon Aiba: (Mr. Sejima is a wealthy man.)
      Aibear icon Aiba: (Perhaps it is his pet.)
      Date icon Date: (Really...)
    2. A pond.
      There are many koi in the pond, as well as a salamander.
  • Day 3: gyoukAI, during the 7:54 PM investigation segment:
    1. Date icon Date: (Aiba, look! A Kappa!)
      Aibear icon Aiba: (He is a wealthy, powerful man.)
      Aibear icon Aiba: (It is not surprising that he owns a pet Kappa.)
      Date icon Date: (Really.)
      Date icon Date: (Really...?)
    2. Kappa: Give me... cucumbers...
      I feel like I heard a strange voice...
  • Day 4: syuurAI, during the free move investigation segment:
    1. Date icon Date: (Aiba, look! A merman!)
      Aibear icon Aiba: (So is a wealthy politician.)
      Aibear icon Aiba: (It is no surprise to me that he has a merman.)
      Date icon Date: (...)
      Aibear icon Aiba: (Wait, a merman?!)
    2. Merman: Oh, hey everybody! I'm a merman!
      I heard a strange voice just now... Could it be...?
  • Day 5: dakkAI, during the free move investigation segment:
    1. A pond.
      Nobody is around.

Island[]

  • Default dialogue:
    1. There's a small island in the center of the pond.
  • Day 5: dakkAI, during the free move investigation segment:
    1. An island.
      Date icon Date: ("Small island" is "Kojima" in Japanese.)
      Aibear icon Aiba: (The Director Kojima? He's here?)
      Aibear icon Aiba: (It honestly wouldn't be that weird for him. But he's not here.)
    2. There's a small island in the pond, but it's not Kojima.

Veranda[]

  • Day 4: youdAI, during the free move investigation segment:
    1. There's a rest area with a roof over it.
  • Day 5: dakkAI, during the free move investigation segment:
    1. There's a veranda, like a rest area.
  • Day 5: dakkAI, during the free move investigation segment (zoomed in):
    1. Date icon Date: (That's So...)
      Date icon Date: (Next to him is...)
      Date icon Date: (Hitomi?)
      Aibear icon Aiba: (It looks that way.)
      Date icon Date: (Why?)
      Date icon Date: (What's Hitomi doing with So?)
      Aibear icon Aiba: (...)
      Date icon Date: (...)
      Iris icon Iris: Date? What's wrong?
      Iris hasn't noticed them yet.
      I decided to ask her about them.
      Date icon Date: You said you don't know So Sejima, right?
      Iris icon Iris: Right, I don't.
      Date icon Date: What about your mom?
      Date icon Date: Does she know So?
      Iris icon Iris: I don't know...
      Iris icon Iris: I don't think she does.
      Date icon Date: Do you ever talk politics at home? Anything like that?
      Iris icon Iris: Not particularly...
      Iris icon Iris: Why are you asking me this?
      It was at that moment.
      Two bodyguards dressed in black came running out of the mansion.
      They had panicked looks on their faces.
      Mamoru icon small (unofficial) Bodyguard: We told you, you can't come in here!
      Mamoru icon small (unofficial) Bodyguard: You can't do what you want just because you're a cop.
      Mamoru icon small (unofficial) Bodyguard: You're trespassing. That's a crime, you know.
      Mamoru icon small (unofficial) Bodyguard: Get lost.
      No use pushing it.
      If they called HQ, we would get arrested for sure.
      And what would happen to Iris...?
      Who would protect her?
      Naix is a huge organization. They have people everywhere.
      I can't risk being caught. Then I wouldn't be able to save Iris.
      Date icon Date: Fine...
      Date icon Date: Let's go, Iris.
      Iris icon Iris: Yeah...

Inside[]

Wall Scroll[]

  • Day 5: zugAI, during the 2:21 PM investigation segment:
    1. A hanging scroll.

Low Table[]

  • Default dialogue:
    1. An expensive-looking table in the middle of the room.

Chair[]

  • Default dialogue:
    1. There's a cushion on top of the chair.

Folding Screen[]

  • Default dialogue:
    1. A folding screen.

Iron Pipe[]

  • Day 5: seisAI, during the 11:10 PM investigation segment, after the battle with the bodyguards:
    1. Mizuki's favorite metal pipe...

Sliding Door[]

  • Day 5: seisAI, during the 11:10 PM investigation segment, after the battle with the bodyguards:
    1. Aibear icon Aiba: (Have you looked on the other side of the sliding door?)
      Date icon Date: (Not yet.)
      Date icon Date: (But I know there's another room back there.)
    2. I want to know what's behind the door.
      But I can't move. So will see me...

Large Vase[]

  • Day 5: zugAI, during the 2:21 PM investigation segment, before approaching it:
    1. Date icon Date: There's something strange about this vase...
      Date icon Date: Ugh...
      Aibear icon Aiba: (What is it?)
      Date icon Date: This is definitely where the smell is coming from.
      Aibear icon Aiba: (Is there something inside?)
      Date icon Date: Maybe, but the opening is covered by a metal plate.
      Aibear icon Aiba: (The lid is fixed with a bolt. It will not open easily.)
      Date icon Date: Yeah...
      Aibear icon Aiba: (Then, as is standard procedure...)
  • Day 5: zugAI, during the 2:21 PM investigation segment, after approaching it:
    1. I need a way to see inside...
  • Day 5: zugAI, during the 2:21 PM investigation segment, after approaching it (with X-ray):
    1. Date icon Date: What the?!
      Aibear icon Aiba: (Date, destroy the vase!)
      Date icon Date: Got it!

Vase Shards[]

  • Day 5: zugAI, during the 2:21 PM investigation segment, after breaking the vase:
    1. Fragments of the broken vase.

So's Body[]

  • Day 5: zugAI, during the 2:21 PM investigation segment, after breaking the vase:
    1. So's body...
      Cut into pieces.

So's Head[]

  • Day 5: zugAI, during the 2:21 PM investigation segment, after breaking the vase:
    1. Aibear icon Aiba: (That is the head of So Sejima.)
      Date icon Date: The left eye is hollowed out...
      Aibear icon Aiba: (This is most likely a crime committed by the New Cyclops Killer.)
    2. Date icon Date: Do you have an estimated time of death?
      Aibear icon Aiba: (Today, some time between 11:00am and noon.)
      Date icon Date: That's about when I was talking to Ota at Matsushita Diner...
      Aibear icon Aiba: (At that time, Mayumi was in police custody and Iris was in the ICU of Central Hospital.)
      Aibear icon Aiba: (They have not moved.)
      Date icon Date: That means Ota, Mayumi, and Iris couldn't possibly have committed the crime.
      Date icon Date: Assuming that this is the work of a single killer, those three can be eliminated from the list of suspects.
      Aibear icon Aiba: (Ota, Mayumi, and Iris are not the New Cyclops Killer.
      Date icon Date: Right.
    3. Date icon Date: By the way, why is there no one in the mansion?
      Date icon Date: No bodyguards, no housekeepers...
      Aibear icon Aiba: (I do not know.)
      Date icon Date: Does So have family?
      Aibear icon Aiba: (So Sejima's wife died in labor 30 years ago giving birth to their son.)
      Aibear icon Aiba: (Their son is currently living abroad.)
      Date icon Date: So lived here alone?
      Aibear icon Aiba: (Do you find that suspicious...?)
      Date icon Date: No just...
      Aibear icon Aiba: (Date, a call from Pewter.)
      Date icon Date: Connect me.
      Pewter icon small Pewter: Date, the Psync machine is up and running!
      Pewter icon small Pewter: You can Psync with Mayumi now.
      Date icon Date: Oh, thanks, Pewter...
      Date icon Date: But there are more pressing matters now.
      Pewter icon small Pewter: Did something happen?
      Date icon Date: Yeah. I found So Sejima's body.
      Date icon Date: With the left eye hollowed out.
      Pewter icon small Pewter: What?!
      Date icon Date: I'm at the Sejima household.
      Date icon Date: Send the investigation team over.
      Pewter icon small Pewter: I can answer your questions when I get back to ABIS.
      Pewter icon small Pewter: Got it!
      Aibear icon Aiba: (Date, what is your plan?)
      Aibear icon Aiba: (Wait until Crime Scene Investigation arrives?)
      Date icon Date: No, there's something I need to do.
      Date icon Date: If that taxi driver was telling the truth, Mayumi was at the warehouse yesterday.
      Date icon Date: And we know the chocolate we found at the scene was hers.
      Date icon Date: Maybe she saw something. Maybe she knows something we don't.
      Date icon Date: Some kind of clue or information about the culprit.
      Aibear icon Aiba: (Then...)
      Date icon Date: Yeah. We're going to Psync with Mayumi.

Item Dialogue (AINI)[]

Mansion[]

  • Default dialogue:
    1. So Sejima's mansion.

Tree[]

  • Default dialogue:
    1. There's a tree here.

Garden Stone[]

  • Default dialogue:
    1. It's a garden rock.

Topiary[]

  • Default dialogue:
    1. It's a topiary.
  • 2/15: Not All A Dream, during the 4:10 PM investigation segment:
    1. Tama NI ball icon small Tama: (It's a giant Subterranean Mamul!)
      Ryuki icon small Ryuki: (It's a topiary! Now's not the time to be messing around!)
      Tama NI ball icon small Tama: (S-Sorry...)

Lantern[]

  • Default dialogue:
    1. It's a lantern.

Bridge[]

  • Default dialogue:
    1. A stone bridge.

Pond[]

  • Default dialogue:
    1. It's a pond.
  • 2/15: Not All A Dream, during the 4:10 PM investigation segment:
    1. Kappa: Give me...cucumber...
      Did I hear something...? Forget it!
      This is more important!

Small Island[]

  • Default dialogue:
    1. There is a small island in the middle of the pond.

Rest Area[]

  • Default dialogue:
    1. There's a rest area with a roof.

Gallery[]

Trivia[]

  • On Day 5: Tuesday -dakkAI-:
    • If you examine the Topiary, Date will think to himself that it's a blob, and that aligning 4 of them together would make them disappear, before correcting himself. This is a reference to the Puyo Puyo video game series, in which colored blob creatures named "Puyo" fall on a grid, and aligning 4 of the same color make them disappear, moving the remainder downwards.[2]
    • If you examine the Island, Date will mention how "Small Island" sounds like "Kojima" in Japanese, at which point Aiba becomes excited at hearing that The Director Kojima was present. When she realizes he's not here, she exclaims "It honestly wouldn't be that weird for him." This is a reference to video game creator and director Hideo Kojima, famous for his eccentric style of game direction and storytelling, as featured in games such as Metal Gear Solid and Death Stranding.[3]
  • Out of all the locations featured in the video "A-set Reservations Unknown", the Sejima Residence was the only one not properly introduced by name.

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[]

  1. Day 3: Sunday -syokubAI-
  2. Puyo Puyo on Wikipedia
  3. Hideo Kojima on Wikipedia
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