Noroware Kyoushitsu ~Kounai Itsudemo Dokodemo Yaranakucha?!~

One morning, during a routine classroom inspection, students are shocked to find their bags crammed with erotic toys and objects. A suspicious adult film starts playing on the class TV, as if a god, spirit, or monster is teaching them the virtues of lewdness. Class president Minami is tasked with organizing the items but gets interrupted by classmate Anri's curiosity, collapsing from exhaustion. The next day, when she confronts some boys about strange behavior, they reveal a video of Minami masturbating with one of the toys—she's seen smiling lasciviously and saying, 'Please tell me how many times you came using this video tomorrow.' Minami denies everything, and Anri tries to delete the clip, but one boy runs off and is swallowed by darkness. Panic erupts, and an erotic video appears on the TV as teacher Hinano recalls a similar incident from her school days. She declares the class is cursed: they must engage in sexual acts daily, or escapees will be trapped in humiliating darkness. The boys enjoy the situation, while Minami's pleas go unheard as debauched school life begins.