The main character, Seiya, has been playing tennis since he was a small boy.
After quitting the sport as a competitor, Seiya joined a small tennis circle at the university he entered.
There, he enjoys his circle activities with his seniors and classmates who are a little different from him.
The most important reason for him to feel happy.
The biggest reason was her classmate Airi Yoshino.
Seiya falls in love with Airi, who is kind and ladylike to everyone.
But then, he witnesses “something” going on in the club room...​