Maruo Eiichiro (voiced by Taishi Murata) has been an excellent student since he was a child. There is no course in the school that he cannot get an excellent grade. However, even such an excellent Eiichiro has weaknesses. He sits at the table to study for a long time, which leads to a serious lack of exercise. In order to make up for this shortcoming, Eiichiro decided to play tennis and joined the tennis club called STC. From the initial resistance to the gradual addiction, Eiichiro, who realized the unique charm of tennis, decided to become a professional tennis player. With the company of like-minded partners such as the lively and lovely Takazaki Najin (voiced by Minako Kotobuki), the powerful and technically first-class Jiangchuan Cheng (voiced by Daisuke Namikawa), Fukazawa Yuki (voiced by Hiro Shimono), who aspires to become a coach, and the genius child Tajima Yuki (voiced by Yuki), Eiichiro is getting closer and closer to his ideal.