Have you ever played a killing game?
Do you want to play a killing game... With no turning back?
Without the right to choose, the persecuted players enter this game and have to find the two people whose brains have been exchanged among all the people.
Senseless killings, inaudible singing, and more people had to be sacrificed for self-saving again and again.
After her mother was imprisoned, Kokoro, a female high school student, found a notebook about this game. She was not a player, but became a part of the reincarnation of the game as a bystander...