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

It is match 10 of a 1-set match, and Eiichirō leads 5 games to 4. Eiichirō begins to up his speed against Hiromi, and with it he stays even at 30-30. Just then Hiromi's legs cramp up, allowing Eiichirō to get two easy aces and win the match 6-4.

Eiichirō investigates going Pro, but his reaction from his parents is less than he expected. Eiichirō joins Natsu at the first round of the All Japan Pro to watch the debut match of Ike Souji.

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.

Eiichiro thought he was successfully ignoring the crowd's roaring cheers for Ide, but his body was reacting to it more than he realized. The pressure of playing in front of a dramatic, Ide-centric crowd is troubling Eiichiro.

The match between Eiichirou and Nabae finally reaches its thrilling climax, and the former risks losing to envision his victory.