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AI: The Somnium Files Wiki
Guide


PSYNCIN' IN THE SUSTaiN is a Somnium based on Matsushita Diner.

It is a Somnium created from Mayumi Matsushita's dream by the Psync Machine. ABIS investigated this Somnium to gain additional information about Mayumi's involvement with the attempted murder of Iris Sagan and Ota Matsushita.

History[]

Summary image 067.png

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Mental Locks[]

Mental Lock #1 - "Why...?"[]

Mental Lock 1 SUSTaiN.jpg

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Mental Lock #2 - "Congrats!"[]

Mental Lock 2 SUSTaiN.jpg

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Mental Lock #3 - "For Ota's dream."[]

Mental Lock 3 SUSTaiN.jpg

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Mental Lock #4 - "Sorry."[]

Mental Lock 4 SUSTaiN.jpg

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Mental Lock #5 - "I will never forget."[]

Mental Lock 5 SUSTaiN.jpg

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Objects of Interest[]

This particular Somnium is divided into 6 Time Sections among the 5 Mental Locks. With each change in section, more of the room is filled out, and more objects to interact with become available. The exception being the final section, the Empty Void. The sections are:

  • Section 1: 2 Months Ago
  • Section 2: 5 Years Ago
  • Section 3: 6 Years Ago
  • Section 4: 7 Years Ago
  • Section 5: 15 Years Ago
  • Section 6: A Dark Place
Object Description
Availability Action Cost TIMIE Effect
Sliding Door The sliding door that acts as the entrance to the Matsushita Diner. Patrons enter and exit through this door, as well as the residents of the diner. A dark figure can be seen through the glass.
2 Months Ago Welcome back! 60s [50]
Detail:
Aiba says "Welcome back!" to the figure standing outside. This causes one of Mayumi's lost memories to play out, where Ota comes back home and gets mad at Mayumi for stating his father would come home soon. After that, part of the Diner manifested, and the time changed. Date wonders if this memory that Mayumi forgot is an important one to her, but Aiba worries at how it's a sad memory.
This action moves on to Section 2: 5 Year Ago!
Leave us alone! 85s Random
Detail:
Aiba says "Get out of here!" to the figure standing outside. Date notes that the figure won't go away, and Aiba states that they're not from a collection agency.
Welcome. 65s [20]
Detail:
Aiba says "Welcome! Come on in!" to the figure standing outside, but Date asks her why she said it that way. Aiba then realizes that the person at the door isn't a customer.
We're closed. 70s Random
Detail:
Aiba says "We're closed today" to the figure standing outside. Date notes that the figure won't go away, and Aiba states that they may not be a regular customer.
Phone A land phone owned by the Matsushita family. When approaching the phone, it begins to ring. Date suggests trying to pick the phone up.
5 Years Ago ... 90s Random
Detail:
Aiba picks up the phone and says nothing. After some silence, Aiba exclaims in surprise that she is the one millionth caller and has won a fantastic prize, and she only needs to give the caller her bank account information. Date tells her to just hang up.
My husband? 90s 1/2
Detail:
Aiba picks up the phone and asks "My husband?" This causes one of Mayumi's lost memories to play out, where she received the phone call that her husband passed away. After that, part of the Diner continues to manifest, and the time changes again. Date states that it's a significant memory to her, and Aiba wonders if that will have a negative effect on Mayumi. Date persists, insisting they continue forward.
This action moves on to Section 3: 6 Years Ago, unlocking Mental Lock #1!
Wrong number. 40s [50]
Detail:
Aiba picks up the phone and says "You got the wrong number!" and hangs up. When Date asks her why she hung up, she simply states it was the wrong number, but the two are not sure. After some time, the phone doesn't ring, and Aiba takes this as proof that it was a wrong caller, but Date is still not sure.
To-Go order? 55s Random
Detail:
Aiba picks up the phone and asks "Is this a to-go order?" Date responds with a fried rice set order, with okonomiyaki and french fries. Aiba asks him if that order has too many carbs for him, and he responds by saying that he has some health tea with him. Aiba begins to complain at him, saying that he can't use tea to fix an unhealthy lifestyle and that he must exercise instead. Date apologizes, and decides to order Chinese spinach with a liver and leek meal, to which Aiba complains that he shouldn't be ordering more.
Cake A delicious cake resting in one of the tables. Date wonders for who it is.
6 Years Ago Congratulations, Ota! 40s 1/4
Detail:
Aiba says "Congratulations, Ota!" which causes one of Mayumi's lost memories to play out, where Mayumi and Takero congratulate Ota for being accepted into a university. After that, part of the Diner continues to manifest, and the time changes once again. Aiba notes how much of a spoiled child Ota was, and Date states this is what makes him so important to Mayumi.
This action moves on to Section 4: 7 Years Ago, unlocking Mental Lock #2!
Congratulations, Dad! 50s Random
Detail:
Aiba says "Congratulations, Dad!" but no response is given. Aiba states that it must not be for Takero, which disappoints Date.
Thank you! 60s 1/10
Detail:
Aiba says "Thank you!" but no response is given.
Let's push your face in it! 35s Random
Detail:
Aiba says "Let's push my face in it!" before realizing what Date wants her to do. He says that it may trigger a happy memory, so Aiba complies. Once the cake is on her face, she states that she feels empty inside, and wonders how long she'll have to stay like this.
This action will have Aiba wear a cake on her face for the rest of the Somnium.
Envelope An envelope on a low table to the side, which came from the mail. Upon further investigation, they note that it's a bank statement for the Matsushita Family's loan.
7 Years Ago Let's burn it and throw it away. 85s Random
Detail:
Aiba says "Let's burn it and throw it away," but then Aiba wonders if they should freeze it instead. Date decides it's best not to throw it away.
Let's take a break... 90s [1]
Detail:
Aiba says "Let's take a break, I'm tired..." but nothing occurs. In any case, Aiba decides to lay down and says that she'll take a 10 minute nap (which she shrinks to 6 minutes). Date keeps telling her that it wasn't the right choice, but she insists to wake her up when hell freezes over. Date tells her to get up.
Let's do our best. 65s 1/8
Detail:
Aiba says "Let's do out best," which causes one of Mayumi's lost memories to play out, where Takero encourages Mayumi to keep working hard to support Ota. After that, part of the Diner continues to manifest, and the time changes yet again. Aiba notes that they reproduced another painful memory, based on her heavy burden and stress with the diner, but Date encourages her in saying that hardships are worth it.
This action moves on to Section 5: 15 Years Ago, unlocking Mental Lock #3!
Let's forget about it. 50s Random
Detail:
Aiba says "Let's forget about it. We can take it easy..." but then she reminds Date that they're trying to remind Mayumi rather than make her forget.
Odoroki-man Sticker A collection of repeat stickers stuck to the cabinet, which come from the Odoroki-man Chocolate brand. When examining the stickers, a young Ota appears before them, asking for "It."
15 Years Ago Omelet rice? 60s Random
Detail:
Aiba asks "Do you mean omelet rice?" and at first the young Ota reacts with excitement. But then he realizes that's not what he asked this time, even though he loves omelet rice. He then states that he's hungry.
Chocolate? 70s 1/10
Detail:
Aiba asks "Do you mean chocolate...?" to which he responds he asked for Odoroki-man chocolate. This causes one of Mayumi's lost memories to play out, where Ota yells at Mayumi for bringing Momonoki-man chocolate by mistake instead of Odoroki-man. Once he says that he hates her, Ota disappears, which makes Mayumi cry. The Diner disappears, and Mayumi is seen in an empty void, crying on the floor, with only the wall clock left.
This action moves on to Section 6: A Dark Void, unlocking Mental Lock #4!

First time selecting:

Detail:
Aiba chastises Date for his actions, saying that this trauma could harm her if she wakes up. Date insists that they must be going, believing that there must be a memory deep inside if she really loves her family. When Aiba asks if that's his intuition, he declares a resounding yes.
An A-set figure? 85s Random
Detail:
Aiba asks "Do you mean A-set merchandise?" but the young Ota states that he didn't ask for an "A set meal," seemingly being confused.
Don't be selfish! 90s Random
Detail:
Aiba says "Don't be selfish," which makes the young Ota sad, repeating how she promised him something.
Calendar A calendar hanging on the wall by the entrance of the Diner. The calendar dictates the date in which the memory is set.
2 Months Ago Today's date is... 5s ?

Reload

Detail:
Aiba will state the calendar reads 2 Months Ago.
5 Years Ago Random

Reload

Detail:
Aiba will state the calendar reads 5 Years Ago.
6 Years Ago ?

Reload

Detail:
Aiba will state the calendar reads 6 Years Ago.
7 Years Ago ?

Reload

Detail:
Aiba will state the calendar reads 7 Years Ago.
15 Years Ago ?

Reload

Detail:
Aiba will state the calendar reads 15 Years Ago.
Swinging Door A swinging door that leads to the kitchen and the room behind the Matsushita Diner, such as their living room and their bedrooms.
2 Months Ago
to
15 Years Ago
Ota! Come over here! 70s [20]
Detail:
Aiba says "Ota! Come over here!" and then continues to call him over and over. Eventually she taunts him with a girly magazine, stating its either for him or for his dad. After an awkward silence between Aiba and Date, they decide to try something else.
5 Years Ago
to
15 Years Ago
Let's get ready! 50s [40]
Detail:
Aiba says "Let's get ready!" and then wonders what for. Date suggests that maybe they should prepare the diner, since Mayumi works there, but Aiba protests. She states that she's not good with wet areas, but Date states that she's always moist inside his eye socket, which makes her mad the more Date repeats it.
Autograph Two rows of autographs lining the top of the wall, all from famous patrons who have visited the Diner in the past, such as the various idols of Lemniscate. Doing all three choices nets the achievement "Crazy Awful Customers."
6 Years Ago
to
15 Years Ago
The left. 99s Random
Detail:
Aiba reads a name to the far left, which reads "Hongo." Date asks who that is, and Aiba states that she can't imagine his face.
A jingle from Nine Hours Nine Persons Nine Doors plays, triggering one necessary point for the achievement.
The right. 12s Random
Detail:
Aiba reads a name to the far right, which reads "Mikimoto." Date asks who that is, and Aiba states that it's a photographer with a beard, looking like a mountain man.
A from Kamaitachi no Yoru plays, triggering one necessary point for the achievement.
The middle. 78s Random
Detail:
Aiba reads a name in the middle, which reads "Enoshima." Date asks who that is, and Aiba states that she "hopes" they will find out.
A jingle from Danganronpa plays, triggering one necessary point for the achievement.
Bucket A bucket with some liquid inside, sitting by a table with a mob next to it.
6 Years Ago
to
15 Years Ago
Delicious! 60s Random
Detail:
Aiba says "Delicious!" but then she realizes that Date wants her to drink the contents of the bucket. She eventually complies, and once she's done drinking, she states that it's actually delicious, and how the flavor from the Diner's food would be collected on the floor. Date can't believe that Aiba would've actually drank the bucket, and Aiba states that he has "an uncanny ability to drive people to murderous intent." He responds that he's a love and peace kind of guy, and Aiba states that's her point.
Let's wear it. 80s Random
Detail:
Aiba says "Let's wear it," but then realizes what Date is having her do. She eventually complies, putting on the bucket on her head. She states that her defenses have increased, and that she is impervious to telepathic interference. Date says "You're afraid. I remember," and Aiba responds with "I will never forget this, Date."
This action will have Aiba wear a bucket the rest of the Somnium.
Menu An old paper menu at the booth. It lists various items in the Diner menu.
5 Years Ago
to
15 Years Ago
One ramen, please! 70s 1/2
Detail:
Aiba says "One ramen, please!" but then Aiba wonders what an order could accomplish. Date explains his line of reasoning, in which asking for ramen could trigger a memory of Mayumi serving her customers, but Aiba reminds him that her memories of customers are still very much present, having forgotten the diner closed down.
Let's come up with a new menu. 65s Random
Detail:
Aiba says "Let's come up with a new menu," and then comes up with a brand new menu item: Matsushita Set Meal, which is sautéed matsutake and shiitake mushrooms, for 3,980¥. Date decides against it.
Beer Poster A beer poster, where Hanayo Nasu's older sister, a swimsuit model, is framed in the center of the poster as she holds the bear in her hands. The poster has been hanging there for years.
5 Years Ago
to
15 Years Ago
Looks like me when I was young! 50s ?
Detail:
Aiba says "Looks like me when I was young!" but then she states that Mayumi and the model don't look alike. Date then says that the comparisons lie in that the poster has a beach in the background and that Mayumi looks like a sea creature. Aiba chastises him, telling him to be nice.
I could use a beer. 75s ?
Detail:
Aiba says "I could use a beer," but then wonders if Mayumi would say that. Date states that he would, and Aiba chastises him for it.
Wall Clock A wall clock that hangs by the sliding door. The clock is broken, and no time can be discerned from it.
2 Months Ago
to
15 Years Ago
The time is... 5s ?

Reload

Detail:
Aiba determines that the time has stopped on the clock.
A Dark Place Turn Back Time 100s ?
Detail:
Aiba moves the clock's hands to make time go in reverse. Suddenly, the two appear within the Matsushita Diner again, with Ota still asking about what he wanted. Aiba tells Date that time is a precious resource and to make good use of it.
This action reverses back to Section 5: 15 Years Ago.
Advance Time 100s ?
Detail:
Aiba moves the clock's hands to make time go forward. With that, Mayumi runs towards the light, and the memory where she received her floral apron and knife from Takero and Ota plays out. With that Date states that they can return to the real world. Aiba then states that Date's intuition could be right every so often after all.
This action unlocks Mental Lock #5, awakening Mayumi from her dream!

Hidden Item[]

  • The hidden item appears in Section 5: 15 Years Ago, once the entire Diner has been restored. It is located under the right side table closest to the Odoroki-Man Sticker.

Trivia[]

Zero Escape, Danganronpa, and Banshee's Last Cry (Kamaitachi no Yoru) spoilers here!
  • The three autographs needed for the "Crazy Awful Customers" achievement, obtained in this Somnium, are named, from left to right, "Hongo," "Enoshima," and "Mikimoto". These three names refer to Gentarou Hongou from Zero Escape: Nine Hours Nine Persons Nine Doors, Junko Enoshima from the Danganronpa series, and Yousuke Mikimoto from Kamaitachi no Yoru (renamed Jonas Faberge in the English release, Banshee's Last Cry). These three characters are the main villains of their respective game(s), hence why they are referred to as "crazy awful customers".
    • For the choice to read Hongo's autograph, it takes up 99 seconds to obtain. This is most likely a reference to his game, sometimes abbreviated to 999.
    • For the choice to read Enoshima's autograph, it takes up 78 seconds to obtain. This is most likely a reference to Class 78th, Enoshima's class in Danganronpa: Trigger Happy Havoc.
    • For the choice to read Mikimoto's autograph, it takes up 12 seconds to obtain. This is potentially a reference to the 12 other characters in Kamaitachi no Yoru, which are capable of becoming Mikimoto's victims in the worst ending possible in the game. It could also just simply be a reference to the 12 people staying at the Spur Ski Lodge (Snowflake Inn in English), if the already deceased Ichirou Tanaka (John Jones in English) is not counted.

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 DateAI-Ball/AibaIris 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
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