Hikaru is a second year high school student who is in love to with his teacher, Shima to the point of obsession... so much that he forces himself on him one day after school. While he doesn't feel the same way about Hikaru, Shima nonetheless proposes that Hikaru atone for his sins by pretending that the two of them are lovers until he graduates. And thus, the two are swept up in a whirlwind of passion and drama until the end of Hikaru's high school career draws close.

Includes three unnumbered side stories.