Planned Release Date: Nov 17, 2026

About This Game

A Fair-Play Mystery Where Every Clue Is in Plain Sight

Built from prose, illustrations, music, and ambient sound, this is an interactive mystery novel that plays completely fair. There are no cheap twists or hidden cards—every single clue needed to solve a case is written in black and white on the pages you have already read. Reaching the truth comes down entirely to your own sharp eyes.

In every case here, someone steps forward to confess.
Inside the interrogation room, you face off against the suspect across a written transcript. Their statement weaves truth with lies. Press them on details, present physical evidence, or flip right back to an earlier page in the story to expose the holes in their alibi.

Yet breaking a lie is only half the job. Beyond the mechanics of the crime, you have to uncover why someone would take the fall in the first place—because more often than not, buried beneath a false confession is the one thing that person was desperate to protect.

The Story: It Starts With a Bowl of Warm Soup

December 2015, Amesaka City. In a hilltop estate in the Yamate district, the family's eldest son falls down the stairs to his death. Early the next morning, the live-in housekeeper walks into the Furumachi Precinct and turns herself in: "I pushed him."

The case is quickly closed as a settled matter. Only Makoto Kuga, the patrolman on night duty, jots down a few details that refuse to add up—the bowl of soup at the scene was still warm, yet the coroner placed the time of death two to three hours earlier.

Not long after, Kuga is transferred to the Family Registry Division. For the next eight years, he sits behind a municipal window processing the city's births, marriages, and deaths. He keeps a quiet eye on every form slid across the counter, checking them line by line. Slowly, the cold case from eight years ago begins to resurface through stacks of registry paper.

How You Investigate

• Note the Details: Crucial phrases in the text are highlighted in gold. Click to inspect them closely and log them into your case notebook.
  
• Interrogate Face-to-Face: Examine the suspect's statement line by line. Press for more context, present evidence, or open up a previously read page to point out a direct contradiction.
  
• Cross-Check the Registry: Death certificates, birth records, family registry transcripts... lay official documents side by side. A mismatched date, signature, or address is often the exact wedge you need to crack a case open.
  
• Hands-On Deductive Mechanics: Rub a pencil over a notepad to reveal indented writing from a torn-out page, mark up a closing report in red ink, trace a missing person across regional registry transfers, or sketch a crime scene floor plan from witness testimony—every chapter introduces a tactile investigation mechanic tailored to the story.

A Case File Always Within Reach

Every chapter you read stays archived in your dossier. Whenever an interrogation hits a wall, you can flip back through previous chapters and read an earlier passage straight to the suspect's face. And if you ever find yourself truly stuck, let Kuga take a sip of coffee—he will remind you which chapter holds the answer between its lines.

Inside This Dossier

• Twelve chapters spanning 2015 to 2024, chronicling four homicide cases and three family registry mysteries
  
• A substantial script roughly the length of a full-scale crime novel (6–8 hours for a single playthrough)
  
• Over 260 crime scene and evidence illustrations woven into the text, alongside more than 100 character portraits
  
• Original music and immersive ambient soundscapes tailored to every scene (Note: this game does not feature character voice acting)

※ Content Warning: This game contains written descriptions and illustrations depicting homicide, the death of minors, and suicide.

NN STUDIO Interactive Audio-Visual Novel Series

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

The illustrations were generated with AI image models, then selected, edited and unified in style by hand. Some animated shots in the trailer were generated with an AI video model from the game's illustrations. The text was written with AI assistance and revised line by line by the author. The Japanese, English and Korean translations were drafted by AI and then proofread.

Mature Content Description

The developers describe the content like this:

The game depicts, in text and still illustrations, murder scenes, bodies and some blood, the death of a child in a traffic accident, suicide, and domestic violence and drinking. No animated gore and no sexual content.