Trapped inside a high-tech complex with five classmates and his teacher, Keisuke learns that escape requires completing a series of intimate pairings dictated by an unseen voice. When Miyako openly defies the rules, the group witnesses the lethal punishment that follows, leaving everyone shaken. Amid the panic, Nemu quietly approaches Keisuke with an unexpected offer, forcing him to weigh his protective instincts toward Kanae against his own buried impulses as the first round begins.