Haruka Nanase, Rin Matsuoka, Makoto Tachibana and Nagisa Hazuki are four childhood friends with a passion for swimming, being a part of the Iwatobi Swimming Club since grade school. Although, when Rin suddenly leaves to attend an elite boarding school in Australia, the group slowly drifts apart. Some years later Haruka, Makoto and Nagisa reunite with a much darker Rin, who challenges Haruka to a freestyle race. Rin wins, but with his attitude towards them still harsh, the group decide to form the Iwatobi High Swimming Club, in the hopes that they can go back to being friends with Rin like they used to.
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