Five men and women, including female student Misuzu Saeki (Aika Ota), nail artist Yuko Hagiwara (Natsumi Hirajima), find themselves locked up in a classroom by an unknown persons. They are then forced into participating in a survival game called "Class". The theme of revenge is behind the game. Meanwhile, a reporter named Bito hears of a rumor involving a revenge organization against bullying. Bito gets closer to uncovering the truth on that revenge organization ...