Ei-chan (A-chan) is famous at his school for being a top model student. He is well known for his analytical ability and his ability to compile data. He is so kind in fact that he will loan you his rewritten more organized notes. Which are said to have greater value than most books. One day he decides that he is getting out of shape and wants to start an after school activity. After the school idol Natsu borrows his notes, and subsequently ruins them, she invites him to play tennis at her tennis club. Ei-chan is thrown into the world of tennis with no experience. Lucky for him he has the ability mine data from anything and starts his quest to become a great tennis player using his ability to take notes and learn from watching others. Plus he has the cute Natsu there to help fill in the blanks when he cannot figure something out.