Yuuichirou is a self-proclaimed "bad boy" who loves to dress alternatively and is always worried about his appearance. He likes to go out with friends, but has never kissed or dated anyone before. But his life turns upside down when his father remarries and Yuu is transferred to a very strict school, where he cannot wear what he wants or even bring a cellphone. Deciding to rebel, he dresses how he likes on his first day, and because of that, he is called out in front of the entire school by the student council president: Mikaela, a boy who is the complete opposite of Yuu.

To make his situation worse, when Yuu gets home, he finds out that he has a new brother, and it turns out to be none other than Mikaela himself. Annoyed by the circumstances, the student council president kisses Yuu in an effort to prove a point. However, everything changes when Yuu seems to like it and cannot stop thinking about it.