The real-life story of the swimming club's innocent childhood friend being taken advantage of by delinquents!! NIMA-020

Keita and Saki grew up together, calling each other "Kai" and "Saki," and pursuing the same dream of swimming. They see each other as the opposite sex and develop a secret romantic relationship. When Keita successfully joins the swimming team, Saki knows he intends to confess his feelings to her, so she seeks help from her senior, Miwa. However, Miwa uses this opportunity to take Saki's virginity…