In beach volleyball, a strong partnership is essential as there is no room for individual efforts. Haruka Oozora learns this lesson when she moves to Okinawa with her grandmother and cousin, Kanata Higa. While visiting a beach, Haruka joins a group of girls playing a friendly game of volleyball. However, things take a serious turn when Kanata steps onto the court, and they suffer a devastating loss. Haruka realizes that her cousin's withdrawn behavior stems from her past partnership with Narumi Tooi, where they were a formidable duo until Kanata's height impeded their progress. With the Junior Tournament on the horizon, Haruka must quickly understand the nuances of the competitive game and help Kanata rediscover her passion for a sport she once excelled at, all while battling her own anxiety.