High school student Shun Takahata lives a mundane,
monotonous life, often wishing for excitement to break the tedium of his teenage existence. His wish is granted in a gruesome, supernatural fashion when his teacher’s head explodes during a standard morning lecture. Suddenly, the classroom is transformed into a deadly arena where a sentient, giggling Daruma doll forces the students to play a lethal game of "Red Light, Green Light." Those who move are instantly slaughtered, their bodies pulverized into red marbles. Shun, relying on his quick thinking and observation skills, manages to survive the initial onslaught, becoming one of the few survivors to progress to the next stage of this inexplicable, divine trial.As the games progress, the scale of the carnage expands. The students are transported to a massive floating cube above Tokyo, where they are forced to participate in a series of traditional children’s games—such as "Kagome Kagome" and a tug-of-war against a colossal, predatory white cat—that are twisted into sadistic tests of survival. The motivation behind these games remains shrouded in mystery, framed as a cruel entertainment for bored, omnipotent gods looking to cull humanity. Shun finds himself navigating shifting alliances, most notably with his impulsive, sociopathic classmate Takeru Amaya, who thrives in the chaos and relishes the violence. While Shun fights to protect the innocent and find a logical way out, Amaya views the situation as an opportunity to prove his own dominance in a world stripped of moral constraints.The tension reaches a breaking point as the number of survivors dwindles to a handful of traumatized teenagers. They are forced to confront the architects of their suffering, revealing that the games are not merely about physical skill, but about the manifestation of human will and the desperate instinct to endure. Through intense
psychological duress and constant brushes with death, Shun must decide if he is willing to sacrifice his humanity to outlast the gods themselves. The narrative crescendos into a final, harrowing confrontation that questions the nature of destiny and the price of salvation, leaving the survivors to grapple with the haunting reality that their lives are nothing more than playthings for entities that view human suffering as a trivial, temporary amusement.