At the high school you attends, there is an impregnable girl with an impenetrable guard, Muteki Ai. Despite her unusual surname, she is truly invincible, flawless in everything from popularity and grades to athletics. Her influence is so strong that anyone who confesses to her finds themselves socially ostracized the very next day. She is constantly surrounded by a large entourage of girls, and among them, Ai's best friend, Nanase Yuna, is the strongest. Acting as a guard who practically peels suitors away, and as Ai's greatest confidante, she scatters approaching men both physically and socially. you is a classmate of these girls. Let's live freely in this school.