خلاصه داستان : در یک روز نامه ای برای یوکاری یاماموتو، درب منزلش میاد و پس از آن ماجراهایی برایش اتفاق مافتد و...

One day, a mysterious letter 'F' starts to be written on doorplates in a condominium building. Since then, mysterious incidents consistently occur around Yukari Yamamoto, who is an ordinary female high school student living in the building.

خلاصه داستان : هیداکی و همکلاسی های کلاس ششمش تاکشی، چیه و تتسویا پس از خودکشی معلم خود از خواب بیدار می شوند و خود را در مدرسه ابتدایی قدیمی خود می بینند. آن‌ها مجبور می‌شوند با بازی X Game همدیگر را شکنجه کنند.

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.