Aoi and Nana come to a southern island to cheer up Nana, who recently got divorced. The two were best friends in their school days on the volleyball team, but this was their first trip together since getting married. Their old friend Miwako also lives on the island, and the two are looking forward to meeting her again. As they walk along the beautiful sandy beach, they forget about their daily lives and become more open-minded. Then, they meet a local man on the beach volleyball court and decide to play beach volleyball. However, they end up losing miserably and being ridiculed, so they decide to take revenge by participating in a beach volleyball tournament...