Rin is a cold guy, aloof but only trusts Isagi. The Kaiser is a German prodigy, arrogant and domineering. Shido is a noisy guy, he goes where people don’t ask. Karasu is just as noisy as Shido. The rest are normal. The killer is Rin herself. but no one knows about it. There are no leads, Rin was with Isagi last night. then, the other players must solve the riddle.