
Kill each other...for science! The class of '89 is trapped in an elite school killing game. Investigate, solve, and expose your classmates in Kumitantei™: Old-School Slaughter, an episodic murder-mystery ADV card-battler inspired by retro anime.
Modeled estimate, not a reported figure. How we estimate →
Media

About
Kumitantei™: Old-School Slaughter is an episodic murder-mystery ADV cardbattler that lovingly fuses retro anime analog horror with killing game! Kumitantei will consist of 6 episodes, beginning to release in early 2026.
"The Empire of Japan, 1989... 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 Rumiko Takahashi’s Urusei Yatsura and '80s anime alongside classic Japanese mystery-adventure games like Danganronpa and Ace Attorney, 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: perfect for fans of visual novels, detective games, and deckbuilders with deep narratives.

Bond with your classmates! Get to know the Absolute Class of '89 by listening to them, giving them gifts, and receiving powerful cards to use during debates!
Investigate grisly murders! Use your detective skills to comb through slain classmates’ crime scenes and take your evidence to trial!
Survive the trial! Cut through the lies and prove your case. Inspired by Ace Attorney and the cult classic Danganronpa series, 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 debates and trials!
Please insert coin! Test your retro gaming skills in a variety of faithfully crafted anemoic riffs on true old-school arcade icons!
Genres
Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Engagement
Hours played at review time, across 43 reviews with recorded playtime.
Reviews
Themes across 43 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
positive critical· bar length = how often the theme comes up
Reviews
Originally went in with low expectations, but this game surprised me in every way. From story, characters, gameplay, audio and visuals; it's all excellent. I really enjoy the art style for this game, as well as it's setting. I came to enjoy the card battles after learning how it all works. The horror aspect while not very prevalent, is something I eventually started to like. I hear it will be more significant in future episodes, which is exciting. What really had me hooked was the soundtrack and characters. All of the characters are great in all ways, like visual design, writing and voice. Major props to the voice actors, they are very talented. The soundtrack is exceptional, especially the main theme used for the opening movie. I don't really have any criticisms or complaints, but they appear to be very onboard with feedback so I imagine future episodes will be even better than what I already enjoyed with just Episode 1. The fact it's not fully released might deter some for now, but I truly believe it will be completed in a reasonable time. Massively recommend this game to anyone who enjoys death game visual novels, like danganronpa or your turn to die. This review is pretty vague, but I wanted to avoid specifics and just generally say I was impressed with what kumitantei had to offer.
This game is incredible from the first second. The phenomenal voice acting, retro arcade aesthetic (and some gameplay even!), and compelling mysteries weave together a beautifully tragic tapestry. The light-hearted moments keep it from getting too depressing, but be warned it will stir some emotions up in you. The protagonist actually has a personality, which I love! Genuinely there isn't a single character I'm not attached to in some form. I love the first foray into this game and can't wait for episode 2! Congratulations, Mango Factory!
Es un muy buen fanganronpa la verdad, aunque no lo catalogaría solo por ser un juego fan de danganronpa porque tiene muchisimas mecanicas únicas que lo diferencian de este mismo aunque teniendo la misma estructura, las animaciones son muy lindas, el arte tambien, los personajes me cayeron bien y el primer capitulo me gustó mucho, espero poder ver más de este juego pronto.
АХУЕННЯА ИГРА ЛУЧШЩАЯ В МИРЕ ПОЖАЛУЙСТА ИГРАЙТЕ
Likely objectively bad, the character designs and setting are a worse version of Danganronpa's by a mile while obviously being inspired by specific characters, and the card system, which admittedly is something I already dislike as a concept, felt like slightly more elaborate Uno, in which I got through each encounter without the slightest bit of trouble while not really trying or caring. It could not exist and I think the game would be better for it. That being said, the voice acting was surprisingly good for what I assume was mostly random people online, the cutscenes despite seeming amateurish art-wise did not seem low effort, and most importantly the murder mystery of the murder mystery game was solid and emotional and I wanted to immediately continue to the next chapter. I am surprised it found a way to make hangman's gambit worse too.
I enjoyed playing the first episode of this game
I was very happy to find out that this exists. Looking forward to the rest of the episodes and other content
Есть потенциал, учитывая идею с картами Я даже кайфанул от игры
没想到只有第一章,不过光第一章就有7小时游戏时间,总的来说比较好玩,原创角色个性很强烈,没有原型的弹丸论破系列的那种伪人感和怪味,作为推理爱好者很喜欢
I LOVE LOVE LOVEDDD THIS I had such a great time playing through it with my friends and the writing was amazing I didn't expect it to get so emotional. The music is amazing, the cutscenes are amazing the art is amazing, the voice acting is amazing, the story and the character writing is all AMAZING. Everything was absolutely ASTONISHING im not even glazing rn but this is probably my favourite game I've played all year so far and I cannot wait for more chapters I will be playing the MOMENT they release!! <3 WOULD RECCOMEND!!
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Trends
Concurrent players on Steam, sampled daily since tracking started.
Audience
Languages: English*, Spanish - Spain, Japanese, Simplified Chinese*languages with full audio support
Estimated from the language of this game's reviews — a proxy for where players are, not official Steam demographics.
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