Kumitantei: Old-School Slaughter
2026 · Mango Factory
Has it aged?Why ↓
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.
The publisher’s description, from its Steam store page.
What it looks like
the trailer, then the store's own shots
Common questions
What everyone else said
we link, we don't reprintHas it aged?
How does it hold up today? Based on recent reviews, how opinions have changed since launch, player activity and updates.
3 / 5
Recent reviews
92%positive (90% all-time)
9reviews in the last 30 days
Too few recent reviews to stand alone, so this leans on its all-time rating.
Reviews via Steam ↗Player activity
7playing at once, on average
newno year to compare yet
Peak: 20 in May 2026.
Player counts via SteamCharts ↗Since launch
92%positive in the last 30 days
Still well liked.
Last updated
May 2026 last update from the developer
Updated within the last year, so still looked after.
Still new, so we hold it near the middle until it has shown how it ages.