Haruka Nanase Makoto Tachibana, Nagisa Hazuki and Rin Matsuoka in elementary school were in a swimming club. After winning the championship on their way apart. Last year. Three of them coming in the older Ivatobi school, and the fourth, Rin Matsuoka, who had returned to Japan from Australia, - in Sametsuka school. At the meeting,Rin Haruka challenges and triumphs. Not wanting to give up, Haruka creates club swimming Ivatobi high school, which includes his former teammates in elementary school, Makoto and Nagisa and newcomer Ray Ryugadzaki.