A group of friends staying overnight in a castle - but one of you is a killer.

Kojou is a multiplayer game for 3-8 players. Each round consists of a day and a night phase. During the day, the players try to find out who the killer is and report them to the police. Additionally, they try to solve quests to make the castle a less hostile place. The killer can set up traps and destroy the other players' efforts. When the night falls, all that's left to do is to hide and run... while the killer hunts down their friends one by one.