Gotou, a virgin high school boy, has a crush on his affectionate gal classmate, Agawa. But one day after school, he catches Agawa having sex with Takayama in an empty classroom. Gotou is devastated, but he soon learns that not only did she have sex with Takayama, Agawa is a slut who'll have sex with anyone who asks. Even...!?

Note: After the release of Chapter 35, author Takeda Super decided to take the story in a new, different direction, so Chapters 31–35 were retconned and new chapters were drawn. However, for fans that enjoyed the original timeline, the old chapters were later compiled into their own volume that even included an additional chapter in that timeline.