Kidnapped. Trapped on an island. Locked inside a castle that reeks of death. Eight captives wake to find a corpse on the floor and a voice whispering that only guilt will set them free. But as riddles twist into traps and allies turn into killers, the line between victim and executioner blurs. Every secret bleeds. Every sin hunts them down. And in this castle, survival has a price. Among them are Yuki, Dazai, and Ren-mafia executives hiding their darkest truths.