After janitor Hanaoka accidentally spilled a bucket of water, female teacher Nana was left completely soaked. In that instant, the men gathered in the classroom could no longer suppress their desires, their eyes fixated on Nana's see-through underwear and the contours of her body beneath her wet clothes. After school, captivated by her beauty, the students began luring Nana into engaging in sexual acts. When Hanaoka found out, he stepped forward to protect her, but he was overpowered and instead subjected her to even more intense humiliation. However, through these events, Hanaoka's true nature gradually came to light.