Eri, a Japanese teacher, is soon to marry a fellow teacher. Her fiancé has begun to talk about changing jobs, saying that teaching isn't worth it. Eri, who loves teaching, begins to feel a gap in their feelings for each other. Meanwhile, she finds out that Ukai, a school janitor, is a writer, and the two of them quickly become closer, but it turns out that the novel he is writing is an erotic novel. Eri is influenced by the novel Ukai has written, which uses her as a model, and gradually becomes as bold as the protagonist in the story...