Rinko Mino, a first-year high school girl, is the manager of the volleyball club. She was living a normal and happy life, falling in love with Yuki, a senior in volleyball club, and trying to do her best at school and at the club. Then one morning she wakes up to find that she has turned into a...... boy! What will happen to the youth of Rinko, the girl who suddenly turned into the opposite sex? (Source: Comic MeDu, translated)