One afternoon after school, the introverted Kiyomi goes back to the classroom to retrieve something he forgot. There, he witnesses Nanjo, a well-known gal, and a male student about to do something inappropriate. When the boy runs away, she invites him to join in, but the germaphobic Kiyomi flatly refuses. However, this only piques Nanjo's interest, and she begins to pester Kiyomi! But Nanjo turns out to be the ideal gal for an otaku...!?