Janus Institute's Class of '89 are trapped and forced to kill each other 'for science', is survival in the cards? A murder-mystery tribute to retro anime and pop culture of 1980's Japan, underlined with a dark twist of horror and conspiracy!
Release Date:
Sep 22, 2025
Developer:
Publisher:
General / Cinematic | KT:OSS - Voice Cast Trailer
Gameplay | KT:OSS - Gameplay Trailer
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General / Cinematic | KT:OSS - Reveal Trailer

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Planned Release Date: Sep 22, 2025

This game plans to unlock in approximately 2 months

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Reviews

“Kumitantei: Old-School Slaughter looks like a promising indie successor to Danganronpa.”
Rock Paper Shotgun

“It's great to see a take on the Danganronpa-flavored killing game format from a fresh perspective with new creatives.”
GamesRadar+

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About This Game

Kumitantei™: Old-School Slaughter is a murder-mystery tribute to retro anime and pop culture of 1980's Japan, underlined with a dark twist of horror and conspiracy!

"The Empire of Japan, 1986... Awoken in a decaying old bunker, sixteen elite Absolute Students are trapped in a kill-or-be-killed Apathy Experiment. Will they band together to uncover secrets of this anemoic alternate past, or lose their humanity and lives in the present?"

Stylistically inspired by Rumiko Takahashi and classic Japanese adventure games, blended with a wide variety of interwoven game-types from deck-building to platforming to puzzle solving, and all tightly wrapped in a plot influenced by the Danganronpa series, Kumitantei™ is a horror-infused love letter to decades of ADVs that wears its many inspirations on its sleeve!

Features:

  • Bond during Free Time! Get to know your classmates by listening to them, giving them gifts, and receive unique powerful cards to use during a Card Battle Debate!

  • Investigate grisly crime scenes! Use your detective skills to comb through murdered classmates’ crime scenes and take your evidence to trial!

  • Survive the Clinical Trial! Cut through lies and deception with a War of Words and one-on-one Card Battle Debates to uncover the truth! These high stakes, high energy Clinical Trials can only end in bloodshed, whether it's the culprit's or everyone else's!

  • Build your deck! Create absolute combos using cards you find in the Bunker and through bonding with your classmates to dominate the Clinical Trials!

  • Earn Prizes with the Kitty Catcher! Easily bond with your new friends by giving them personalized gifts from the definitely-not-rigged Kitty Catcher!

  • Please insert coin! Test your retro gaming skills in a variety of faithfully crafted anemoic riffs on true old-school arcade icons!

Mature Content Description

The developers describe the content like this:

This game may contain content not appropriate for all ages, or may not be appropriate for viewing at work: Frequent Violence or Gore, General Mature Content, Some Nudity or Sexual Content

System Requirements

    Minimum:
    • OS: Windows 10
    • Processor: 2.8 GHz Intel Core 2 Duo or better
    • Memory: 3 GB RAM
    • Graphics: Vulkan or DirectX 12 compatible GPU with at least 2GB of VRAM
    • DirectX: Version 12
    • Storage: 5 GB available space
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