Hanii Miku, a 16-year-old girl, has been in the same tennis team as her crush, Harada Tomonori, for as long as she can remember. Tomonori is not only a skilled tennis player but also attractive and kind. However, there is one thing that irks Miku - Tomonori's brother, Natsume. Unlike his brother, Natsume is notorious for playing with girls' feelings and being arrogant.
One day, Miku discovers something about Natsume that completely astounds her.