Maruo Eiichiro is an honor student in his first year of high school. He's a very methodical person who keeps two sets of notes for class and focuses entirely on his studies. One day, Eiichiro decides to participate in a free trial at South Tennis Club (STC) because he needs some exercise. There, he meets school idol and sweetheart Takasaki Natsu. Eiichiro has taken his first step into the world of tennis

Eiichiro finds himself in a contest with Takuma. Eiichiro has fifty tries to return Takuma's serve. One successful return and Eiichiro wins. However, despite Eiichiro's best attempts to follow his notes and stick to the basics, he can do nothing against one of the strongest serves in the country.

It is down to the final match of the set. Eiichirō trails 5 games to 1, but with a determination to stay on the court as long as possible Eiichirō begins to push Oobayashi.

Eiichirō and Natsu go out on their first date. When Eiichirō asks Natsu what she thinks about him, she tells him he is cheating. Afterwards Eiichirō is allowed to resume practice.