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Kumitantei™: Old-School Slaughter is an episodic murder-mystery ADV cardbattler that lovingly fuses retro anime analog horror with killing game, coming to Steam Early Access in 2025!
"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?"
With a visual style inspired by '80s anime and classic Japanese mystery-adventure games, Kumitantei™ thrusts you into a suspenseful character-driven killing game narrative where your deckbuilding and detective skills are the only keys to surviving. It's a creepy-cute love letter to decades of ADVs that wears its many inspirations on its sleeve!

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!
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Kumitantei: Old-School Slaughter costs Free.
Minimum: 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
Kumitantei: Old-School Slaughter is available on Windows PC.
Review data is not yet available for Kumitantei: Old-School Slaughter.
Kumitantei: Old-School Slaughter was released on Oct 19, 2025.
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