maruo eiichiro (voiced by tashi murata) has always been the title of excellent student since childhood. there are many different courses in the school, and he cannot get excellent student. eee。 however, even such an excellent eiichiro has weaknesses. sitting at the table for a long time to study, resulting in a serious lack of exercise. in order to make up for this shortcoming, eiichiro decided to play tennis, and then he entered the title STC tennis club. from the initial resistance to the gradual obsession and understanding the unique charm of tennis, eiichiro decided to become a professional tennis player. the carefree and lively and cute natsu of takasaki (voiced by sumi naoko), the powerful and first-class ekawa masaki (voiced by naogawa daisuke), the aspiring to become a coach, and the genius child yuki tashima (voiced by yuki yu), the company of these like-minded partners, eiichiro is getting closer and closer to his ideal.