Tenma Tsukamoto is a second year high school student, and like other girls her age, she falls in love. The object of her affection is classmate Ooji Karasuma, but unfortunately she hasn’t confessed her feelings to him. Time is running out because he’s transferring soon! With help from her friends and younger sister Yakumo, Tenma tries things to get his attention like dressing up as a nurse and sending a love letter. What she doesn’t know is that another guy, Kenji Harima, has feelings for her. He gets depressed because she doesn't notice him, and becomes even more of a delinquent.