Riko continues to treat Sensei as her sadistic pet, but her jealousy toward Mashiro leads her to order him to seduce and ruin her classmate. The plan backfires when Mashiro takes control, exposing Riko's secrets and turning the tables on her in a bold classroom encounter. As Riko is forced into submission, a new suspicion arises regarding Noa's involvement in their tangled web of secrets.