To support her friend Nana, who has gone through a divorce, Aoyama Aoi, now married, heads to a southern island with her husband. Once close friends during their high school volleyball days, this trip marks their first vacation together since marriage. Living on the island is Miwa Yamamoto, another former friend they're eager to reunite with. Walking along the beautiful sandy beaches, the women gradually let go of daily stresses and open their hearts. One day, at a beach volleyball court, they meet a local man. Challenging him to a match, they suffer a humiliating defeat and are ridiculed. Determined to overcome this shame, they vow revenge and decide to enter the upcoming beach volleyball tournament.