From ryColaa:

This is the story of Nanase Iruke. She's short, tomboyish, and her one joy in life is volleyball. On Iruka's 17th birthday her Volleyball club is disbanded. Feeling somewhat depressed she and her friends from the club take a trip to the beach and discover Beach volleyball. Iruka can't wait to play and rushes to the court only to be told to give up being a player because of her short stature by the local Volleyball Diva. In a rage Iruka challenges her to a match to prove her abilities. It doest look like she has a chance but Iruka has a secret weapon and nobody will ever make fun of her on the beach again….well….Not about her ability to play Volleyball anyway..