Minako and Mayuko are rival members of their high school's karate club. While staying at a training camp boarding house, one of the other members, Saori, starts to lose her mind overnight. When one of the 10 staff members of the training camp vanishes, Minako starts to investigate the cause...
After a childhood friend's suicide, Hideaki and his former classmates reunite to pay their respects. Soon after, a DVD, marked X arrives revealing a man being tortured, triggering a flashback in Hideaki, reminding him of witnessing a schoolmate being subjected to humiliating batsu (punishment) games. One evening, Hideaki is kidnapped and when he awakens the next day, he discovers he is in a recreation of his old school-room, along with his fellow classmates. Trapped and held captive by mysterious hooded figures, each of them must now play a brutally violent, version of the punishment game, in order to survive.