Beautiful female teacher Yui traps a male teacher inside an empty classroom. He is confined to his underwear, wearing a mask, with his limbs tightly bound in duct tape. Yui tortures him by spreading rumors that "a female teacher is disciplining a male student." Though he initially resists, as Yui torments his nipples and buttocks with a pointer stick and ruler, he gradually abandons his dignity as an educator and reveals his latent masochistic desires. Eventually, he begs her, "Please punish me." While slapping him, Yui whispers, "You were jealous of your students all along, weren't you? This isn't punishment—it's training..."—carving the words deep into his mind.