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The Mizuki Diving Club (MDC) is on the verge of closing down after having financial troubles. The club's new coach persuades the club's parent company to stay open on one condition: that the club sends one of its members to next year's olympics as part of Japan's olympic team.
Yuuichirou Mizuno was a child prodigy in swimming that hit his peak with his bigger than average body size. However, he stopped growing, leading to no improvements. He gave up on swimming, but with the help and encouragement from his friends, he started to get back at it.
When Mizuoka sneaks into the pool after hours for extra swimming practice, he's caught by his classmate Hino! Hino agrees not to tell anyone he's broken in, provided he teaches her how to swim. Mizuoka agrees, and, though he finds himself liking her more and more, he really needs the extra practice for his swimming club status. Will Mizuoka's dedication to his club ranking destroy his chances with Hino?
Chiba Osamu and Arikawa Madoka are in the same middle school class and in the same swimming school on Mondays, Wednesdays, and Fridays. Although they have many opportunities to talk to each other, they never have for years now. They barely acknowledge each other, even though they have met hundreds of times. But when Osamu learns that Madoka is going to quit swimming school when she starts high school, something emotional starts to grow inside of Osamu. First, it began with nothing more than curiosity, but soon it blossomed into something more real. He has to tell Madoka what he is feeling before he never sees her again.
Kaoru, a high school student, falls in love with Sonoko, the leader of his school's swimming club. Although he can not swim, he joins the swim club to seduce her.
Brothers Kei and Shinobu are both part of their school’s swim team. One day, while pining after his brother, Shinobu is approached by the team’s star swimmer, Kuji, and sent for a wild ride. Kuji uses Shinobu’s body in any way he pleases anytime and anywhere. Shinobu has had enough, but allows his torment to continue in order to protect his brother. As Shinobu and Kuji start to become close, Kei reveals his own love for Kuji along with another startling surprise. Meanwhile, a new student enters the swim team and begins to form a bond with Kei. Can this new swimmer replace Kuji in Kei’s heart or will the love triangle continue?
Zhehai Qin stopped doing the sport of swimming due to his secret that he tries hard to keep hidden. But when Xu Wang discovered his secret, Qin must fight him in a swimming race to keep it from being exposed. Their race reignited his love for swimming, which led him to join the Le Shui Swimming Club. His amazing skill in swimming was recognized, giving his team a chance to victory, but his secret won’t be kept in the shadows for long.