The protagonist, Mikami Hiroki, is a diligent member of the discipline committee. He sternly confiscates the goods of his classmates who borrow and lend pornographic books, and coolly ignores his best friend's dirty jokes... but in reality, he is a healthy teenager who spends his days agonizing over his desire to do naughty things.

"It's not that I'm particularly erotic! It's just that there are too many temptations."

Toriumi Hinata, my childhood friend, is a silly girl with big breasts whose breasts seem to be the only source of nutrients. My classmate, Kogure Miori, is the cutest in the class and always glances my way. My cool junior, Seto Suzu, is also a member of the discipline committee and adores me. And my older sister, Mikami Juri, is an honor student with a bro complex.

One day, an incident leads to the start of naughty days with these girls...!?