A Japanese language teacher who was once a literary girl eventually becomes addicted to an affair...

Eri is a Japanese language teacher, who is about to marry a fellow teacher. The teacher's fiance begins to talk about changing jobs if it's not worth it. Eri, who loves to teach, begins to feel the difference in her attitude with her fiance. Meanwhile, when the school clerk Ukai learns that he is a writer, their relationship deepens rapidly, but what Ukai writes was an erotic novel. Eri is inspired by the novel Ukai wrote based on her, and gradually becomes bold like the protagonist of the story...