The protagonist, a teacher named Yamada Takashi, felt bitter about the couples flirting around the school. Among the students, there was a couple rumored to be the best: a serious and refreshing boy and a pure and lovely girl. Takashi harbored immoral desires towards that girl, which grew day by day. One day, under the guise of supervision, he brought her back to the school at night. During a casual chat while inspecting her belongings, he learned that she hadn't even kissed her boyfriend yet.

Even with such a handsome boyfriend, she's still a virgin? Well then, there's only one thing to do!