After the Fade

Yuji Horii's Komiya in the Interrogation Room: AI Went into the Workshop, Not the Interrogation Room

Games and Culture
Games ; Komiya in the Interrogation Room ; Yuji Horii ; The Portopia Serial Murder Case ; AI ; Game Design
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Yuji Horii's Komiya in the Interrogation Room: AI Went into the Workshop, Not the Interrogation Room

It starts at 9 p.m. At 11 p.m. the lawyer arrives. You have twenty moves, and each one advances the clock on the wall by six minutes.

Komiya in the Interrogation Room (Torishirabeshitsu no Komiya) is a free browser mystery that Yuji Horii released on X on October 11, 20261. A hanging scroll has gone missing from a pawnshop safe, and Komiya, a 72-year-old former locksmith, sits in the interrogation room. The player takes the chair across from him.

The post itself is short. Back when he made The Portopia Serial Murder Case on a PC, Horii writes, he came up with the story, drew the pictures and did the programming, alone. Now, he says, you can make a reasonably decent game alone just by giving instructions to AI. The game took "only about thirty minutes," he adds1.

Let me state my position first. I have not played this game. On October 12, 2026, I retrieved the HTML of the public page and read the game script. The moves and numbers below come from that source, not from the feel of playing.

The comparison Horii set up is "alone in 1983" against "alone in 2026," and this piece follows it. But the source does not tell a story about AI being able to make anything. AI entered the workshop where the game was made. It did not enter the interrogation room. And that placement points the other way from what Horii has been saying he wants for the past few years.

In 1983, "alone" meant the width of four commands

The Portopia Serial Murder Case was released by Enix for the PC-6001 in June 19832. In a 2017 interview, Horii recalled doing the art, the sound effects, the programming and the scenario himself, calling it "completely one-person work"2.

There is a more concrete account of what "alone" meant. In a November 2025 talk, Horii said that when he first learned BASIC he knew only about four commands, among them INPUT and PRINT. Portopia moved its story forward with those few commands, in the form of "you type something and it answers"3.

So before it was a matter of talent, being alone in 1983 was a matter of width. The range of commands the maker knew became the shape of the play. The player typed words on a keyboard and the game answered. Moving the case forward by typing instructions to your subordinate, Yasu, grew out of that width24.

The Famicom version of November 29, 1985, ported by Chunsoft, switched to command selection, where you choose actions from a list54. Freedom of input was traded away, and with it went the frustration of not knowing what to type.

The 2026 interrogation room is twenty moves and two meters

Komiya is played entirely with buttons. There is no point where you type words. Here is the structure, taken from source retrieved on October 12, 20266.

ElementWhat the source shows
Time limitTwenty moves. Starts at 9 p.m.; each move advances six minutes; ends at 11 p.m. when the lawyer arrives
QuestionsFive topics (alibi, relationship with the pawnbroker Mitsuboshi, tools, the scroll, finances). The first answer is a lie. Repeating a question adds +6 Resentment
Extra questionBreaking the lie about finances unlocks a question about his late wife (Agitation +6, Resentment −8)
EvidenceFive items, Exhibits 1–5. Confront a statement you have heard; the right match breaks the lie and adds +17 Agitation. A wrong match adds +12 Resentment
AttitudeApply pressure (Agitation +7 / Resentment +14), Offer tea (Agitation +4 / Resentment −15), Wait in silence (Agitation +5), Bluff (success decided by chance)
RecordA list of statements heard. Broken statements are stamped "contradiction"
MetersTwo: Agitation and Resentment. They start at 10 and 15. Resentment at 100 means he goes silent and the session ends
Decisive questionUnlocked after four lies are broken. With Agitation at 80 or above (the "confession zone" mark on screen) he confesses; otherwise Resentment +8
RatingOn confession, S with six or more moves left and Resentment under 45; A with three or more moves left; B otherwise

Japanese press coverage describes two parameters, Agitation and Resentment, which matches the table78.

Following the numbers reveals the shortest path. Ask four questions and break four lies, and after eight moves Agitation sits at 78, just short of the 80 mark. Wait in silence, or ask about his wife, and you cross it. Play the decisive question on move ten and you reach S with ten moves left and Resentment close to where it started. The design can be finished in half the time allowed.

Matching evidence to topics is nearly one-to-one and easy to guess. Exhibit 1 is a security camera still from 12:12 a.m., so it goes against the alibi. Exhibit 4 is a copy of a pawn ledger from five years ago, so it goes against the scroll. As a test of deduction, it is shallow. The "short" and "prototype-like" reactions that stood out on Hatena Bookmark can be explained by this structure9.

"Apply pressure" barely pays off in the numbers

Reading the Attitude row side by side, one thing stands out.

Apply pressure and Agitation rises by 7 while Resentment rises by 14. Wait in silence and Agitation rises by 5 while Resentment does not move. The difference is 2 points of Agitation against 14 of Resentment. Since the interrogation ends when Resentment hits 100, banging the desk is worse than waiting in almost every situation. The screen shown after he goes silent suggests offering tea or waiting in silence, and notes that there is more than one way to press him6.

A minority of reactions raised ethical concerns about a game in which you shout at a suspect. On that point, at least, the game's numbers do not encourage shouting. Whether that was intended, or simply what came out of setting the displayed values plainly, cannot be told from outside.

The formulas are simple, but the dialogue moves in stages. Below 35 Agitation, below 70, and above that, his response to the same attitude changes. Bang the desk while he is calm and he answers "So it's threats" without moving an eyebrow; later his voice shakes6. The tension of the interrogation lives in this staging more than in the arithmetic.

Every line is written in advance

Everything Komiya says sits in the source as a string. The first lie, the restatement after it breaks, the irritation at a repeated question, the retort to the wrong evidence. Randomness is used only to pick among a few prepared lines and to decide whether a bluff works. The game script contains no process that queries an outside service to produce a reply6.

It is a game made by instructing AI, yet there is no AI anywhere while you play. There is no field for typing your own words. The input field that the 1983 PC version opened stays closed, and the choices lean toward the Famicom version.

Set this beside what Horii himself has been saying. At Comic-Con Napoli in May 2025, he said it would be fun to have an adventure game where you solve cases while conversing with AI10. In his November talk that year, he described play such as finding the culprit while talking with your subordinate, or having AI conduct interviews for you3.

Komiya is not that game. AI sits on the making side, and the interrogation room is closed with written dialogue and fixed branches. Horii has not said why, so what follows is speculation. For something made in thirty minutes, a closed structure may have been more dependable than generated conversation. Or he may have wanted to avoid releasing a counterpart that could say anything during play.

In 2023, AI went into the interrogation room and failed

The second guess has a precedent.

In April 2023, Square Enix released SQUARE ENIX AI Tech Preview: THE PORTOPIA SERIAL MURDER CASE free on Steam. The store lists April 23, 2023, and some coverage gives April 24 Japan time114. It interpreted what players typed with natural language processing, offering another answer to the 1983 problem of not knowing what to type.

According to the store page, it originally included a function based on natural language generation (NLG) that produced natural replies to questions without a pre-written response, but this was removed because a risk remained that the AI would generate unethical replies. The page says the function will be considered for reintroduction once research creates an environment where players can enjoy it with peace of mind11. When and how it was removed, in detail, I have not been able to confirm.

The result, as reported, was that straying even slightly from set phrasings dropped you into generic replies4. As of October 12, 2026, its Steam rating is "Very Negative," with 15% of 479 reviews positive11.

Side by side, the placements differ clearly. In 2023, AI was meant to go inside the play; the generating part was removed and only a narrow input field remained. In 2026, AI was used only on the making side and kept out of the play. And for 2027, Zoku Portopia Renzoku Satsujin Jiken: Boukyaku no Maisou is planned, a full remake of the Famicom version with five new investigation files, published by G-MODE and developed by room6, with Horii credited for the original work12. The announcement does not say whether AI is used in its development.

What AI replaced, and what it cannot be said to have replaced

Back to his words. You can make a game without drawing and without programming1. What he says was replaced is the art and the programming. Of the four jobs he did alone in 1983, he does not mention the story.

So the story, that is, the 72-year-old locksmith, the closed shop, the late wife, the pawn from five years ago, and phrasing like "I was home asleep. In bed by ten," did he write it? We do not know. "Just by giving instructions" leaves open the possibility that the writing, too, was left to AI. This piece does not identify who wrote the lines.

The same goes for "thirty minutes." On Hatena Bookmark, the point that thirty minutes presumes a scenario already worked out also stood out9. Whether it includes planning or design time cannot be told from his post1. Still, this much can be said. In 1983, the constraint was that the maker's range of commands became the shape. In 2026 implementation no longer imposes that constraint, and what remains is judgment about what to fix and what to leave open. Ending in twenty moves, the lawyer at 11 p.m., silence at 100 Resentment, not generating dialogue. Whoever first proposed each of these, Horii is the one who chose them and released the game.

Criticism, too, is aimed at that name. A reply to his post asked whether consent had been obtained for training data1, and concerns about copyright and training data appeared on Hatena Bookmark as well, though in small numbers9. Amid a majority of praise for his skill and the interface and reports from people who played, these points are addressed to the author, not the tool. Even if AI took on the art and the programming, the position of answering for a released work has not moved. At least not, judging by this week's reactions.

Relation to earlier articles

When Zakoshow Meets AI asked who the author of comedy made with AI is, and left the answer open. This piece brings a different point of comparison to a question of the same shape. Horii has his 1983 self as a baseline, and can count for himself what he did alone and what he no longer does.

You Cannot Break a Torii — The Japan in Denshattack! Is Made of Checking contrasted the official FAQ's answer that no AI was used with investment in outside reviewers and performers. That work, which spent its costs on having people check, and this one, released by one person in thirty minutes, sit at opposite ends of the same year.

Dragon Quest V's Monster Recruitment System Might Be a Blueprint for AI Agent Design read a Horii game as a metaphor for AI. This piece deals not with a metaphor but with a case where the author himself used AI as a tool.

What remains unconfirmed

  • The AI tool used. The public page is hosted as an artifact on claude.ai, but Horii has not named the tool he used to make the game, and the press has not identified it178.
  • The scope of "thirty minutes," and whether it includes planning or scenario design.
  • Who wrote the dialogue and setting, and how the work was split between Horii and AI.
  • What "don't press the boost button" in his post means.
  • The relation to the 2027 Zoku Portopia, and whether AI is used in its development.
  • Reception in English-speaking regions. Within the scope of this research, no English-language coverage was found.
  • Whether the game has been updated since release. The table reflects source retrieved on October 12, 2026.

AI (Anthropic's Claude) was used in researching and drafting this piece. Note that Komiya is published on a service run by the same company.

References

  1. Yuji Horii's post on X, 7:01 p.m. JST, October 11, 2026, retrieved October 12, 2026. His recollection of making Portopia alone on a PC, the line about making a reasonably decent game alone just by instructing AI, the production time of "only about thirty minutes," and the line "don't press the boost button" come from this post. A reply asking about consent for training data was also confirmed in the same day's retrieval. Horii has not named the AI tool used. Quotations are the writer's translations. ↩ ↩2 ↩3 ↩4 ↩5 ↩6

  2. AUTOMATON, "Yuji Horii" research team, part 1, published December 20, 2017. The June 1983 PC-6001 release, the format of typing commands to control Yasu indirectly, and Horii's statement that art, sound effects, programming and scenario were "completely one-person work" come from this article. ↩ ↩2 ↩3

  3. Famitsu.com report on Yuji Horii's talk at G-CON2025 in Busan, South Korea, on November 14, 2025. His recollection that he knew only about four BASIC commands and made Portopia with INPUT and PRINT in the form of "you type something and it answers," and his remark that a mystery where you find the culprit while talking with a subordinate through AI would be fun, come from this report. ↩ ↩2

  4. AUTOMATON WEST, published April 24, 2023 (the original Japanese article was published at 11:19 a.m. the same day). The distinction between text input on PC and command selection on Famicom, the timing of the tech demo's release, the reason NLG was removed, and the report that straying from set phrasings yields generic replies come from this article. ↩ ↩2 ↩3 ↩4

  5. Famitsu.com article on the Famicom version's 40th anniversary (a re-edit of an article posted November 29, 2024). The November 29, 1985, Famicom release, Chunsoft as developer and the format of choosing displayed commands come from this article. ↩

  6. The public page of Komiya in the Interrogation Room (claude.ai). The HTML was retrieved on October 12, 2026, and the game script was read statically; the writer has not actually played it. The twenty-move limit and six minutes per move, the five topics and extra question, the five exhibits, the four attitudes and their values, the starting values of Agitation and Resentment, the conditions for the decisive question (four lies, Agitation 80 or more), the rating conditions, the staging of lines (thresholds at Agitation 35 and 70), the text shown on silence, and the absence of any outside query all come from this source. A research note that read the same page statically before October 12, 2026, recorded three attitudes and three meters (contradiction, agitation, resentment), which conflicts with what this piece retrieved. The page may have been updated after release, or the on-screen "contradiction" stamp may have been read as a meter; which is the case is unconfirmed. English labels in this piece are the writer's translations of the Japanese UI. ↩ ↩2 ↩3 ↩4

  7. Famitsu.com, published 8:31 p.m., October 11, 2026. An article introducing the post. Komiya's "Agitation" and "Resentment" parameters, silence at 100 Resentment and the production time come from this article. It is not independent criticism. ↩ ↩2

  8. Denfaminicogamer, published 12:24 a.m., October 12, 2026. An article introducing the post, describing the game as made "using generative AI." It does not identify the tool. ↩ ↩2

  9. Hatena Bookmark, a Japanese social bookmarking service. As of October 12, 2026, the Famitsu.com article had 337 users and the public page 226 users. The tendencies described (praise for skill and interface and reports of play were most common, followed by remarks on its brevity and the premise behind thirty minutes, with concerns about copyright and training data and ethical objections to the interrogation depiction in a minority) are a summary of what was read during research, not a tally. No individual comment is quoted. ↩ ↩2 ↩3

  10. Gamereactor, interview with Yuji Horii at Comic-Con Napoli 2025. His remark that an adventure game where you solve cases while conversing with AI would be fun comes from this article. ↩

  11. Steam store page, retrieved October 12, 2026. The listed release date of April 23, 2023, the statement that NLG was originally included but removed over the risk of unethical replies and may be reintroduced as research progresses, and the "Very Negative" rating (15% of 479 reviews positive) come from this page. Rating figures are as of retrieval. ↩ ↩2 ↩3

  12. Denfaminicogamer, published September 9, 2026. The Nintendo Direct announcement, the full remake of the Famicom version with five new investigation files, the 2027 release, the Nintendo Switch / Nintendo Switch 2 / Steam platforms, G-MODE as publisher and room6 as developer come from this article. Horii's credit appears as "original work and production general director" in the article body and as "original work and supervision" in the quoted press release. ↩