Kumitantei: Old School Slaughter Demo Now On Steam

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RETRO ANIME THRILLER ‘KUMITANTEI: OLD SCHOOL SLAUGHTER’ REVEALS VOICE CAST AND DEMO AHEAD OF STEAM NEXT FEST

Actress and vocalist Elsie Lovelock joins a stacked lineup to bring the characters of Kumitantei to life.

Bandung, Indonesia, June 9, 2025 | Mango Factory, the team behind the Danganronpa-inspired murder-mystery card battler Kumitantei: Old School Slaughter, is thrilled to announce that their latest demo is available now on Steam. Following its successful Kickstarter campaign last year, the game now also welcomes eighteen voice actors to the lineup for its Early Access launch this fall.



Introducing the Cast

Kumitantei: Old School Slaughter is an ode to retro anime and pop culture stylings of 1980s Japan. Featuring a class of sixteen eccentric Absolute Students, intricate hand-drawn details, and a twisted horror narrative, players can expect a thrilling introduction to the dystopian alternate 20th century of Kumitantei.. The Empire of Japan, 1986: Awoken in a decaying nuclear bunker, sixteen students are trapped in a kill-or-be-killed Apathy Experiment hosted by a sadistic two-faced cat. Will they band together to uncover secrets of the past, or lose their humanity and lives in the present? Playing as the sheepish Absolute Barista Himari Sanada, it’s your job to uncover the bunker’s many secrets, earn the trust of your strange fellow captives, investigate their grisly murders at the hands of a fellow classmate, and battle it out to discover whodunnit in the high-stakes Clinical Trial!

Card Battle Combat

Progress through Kumitantei’s gruesome story by forging bonds, battling other students, and unraveling twisted mysteries. In this kill-or-be-killed scenario, the game’s trust system can offer unique leverage opportunities in combat. Spending time with fellow classmates and offering them appropriate gifts unlocks new talent cards and advantages in future card battles. These 1-on-1 battles are a hectic tug-of-war for influence; deal attacks with Debate cards, finding weaknesses in your opponent’s argument to strengthen your own. As the battle progresses, present proper evidence against your opponent and strike with The Final Word to silence them. Additional Talent Cards are available to strengthen your gameplay, and high Trust levels with other students may present advantages in battle.

Demo Out Now, Episode 1 Coming Soon

Players can get a taste of the experience in Kumitantei’s demo, available now for Steam Next Fest. The demo features the game’s fully voiced story Prologue, a customizable Card Battle Debate with four distinct opponents, and the Donkey Kong-inspired retro minigame ‘Merlite.’ The game will launch on Steam Early Access later this year, featuring the first episode with eighteen voice-acted characters. Elsie Lovelock (Murder Drones, Hazbin Hotel) performs the game’s city pop-style vocals. Notable cast members include Mia Paige (Fatal Fury: City of the Wolves) as protagonist Himari, Joshua Waters (Honkai: Star Rail) as deuteragonist Moichiro, and Jordan Dash Cruz (Frieren: Beyond Journey's End) as the two-faced cat Nyanus.

Anticipated Episode 1 Features:

Solve a complex murder case to kick off the game’s chilling narrative set in an alternate 20th-century Empire of Japan!

Encounter sixteen uniquely gifted Absolute Students brought to life with full voice acting!

Bond with fellow participants to earn their Trust, investigate gruesome crime scenes, and use your findings to uncover the truth.

Unlock special rewards as you increase your Trust Levels with classmates.

Purchase additional Talent Cards with in-game currency to strengthen your deck.

Leverage your relationships in Card Battle Debates and gain advantages against your opponent.

Experience a stylish and fast-paced Clinical Trial where the game’s card battles and other minigames come together in a dramatically tense debate to discover the truth, all presented in the game’s signature ‘80s anime look!

Wishlist Kumitantei: Old-School Slaughter on Steam for updates on Early Access. For further news, visit Mango Factory’s socials and connect with the developers via the studio’s Discord.


About Mango Factory

Mango Factory LLC. is an Indonesian all-remote indie developer specializing in narrative-driven adventure games. They previously created the animated Danganronpa fanseries Heaven of Despair and are currently developing the retro anime murder mystery Kumitantei: Old-School Slaughter.