"Fine. I'll allow you to join the club." Luna Naruse entered an all-girls' high school dreaming of a sparkling high school life — making friends, enjoying tea after school, and spending graceful days with charming upperclassmen. However, what awaited her wasn't leisurely days or elegant encounters, but... the handball club!? Back in middle school, Luna was a baseball ace who spent her days practicing with the boys. Now, a whole new kind of sporty high school life is about to begin!