Remake of the doujin VN, Killer Queen, with a greatly expanded story. 13 people are locked inside an abandoned building, none of them remember how they got there. Each has a PDA representing a playing card from A to K and a collar device locked around their necks. Each of the 13 PDAs correspond to a different set of objectives ranging from simply surviving to eliminating everyone else. If a player fails to fulfill their PDA's objective within 72 hours or breaks any of the game's rules, their collar will activate and they will die.

Another time, another "game". 14 people have been confined to small rural village and fitted with exploding collars. Each one also has PDA with a unique ability and a condition to remove the collar. If anyone tries to leave the designated area or fails to achieve the condition in their PDA, their collar explodes, killing them. This is the "game" of death, where mistrust and manipulation run rampant and death is common. But this time there's also a catch, as when the "Rain starts to fall"...