Anime Free! seems really popular these days! It starts with four boys, whose names are Haruka, Makoto, Nagisa and Rin. The time of the story sets before they graduate from elementary school. They all participated in a swimming tournament and won, though they parted ways. Years later, Haruka and Makoto reunite with Nagisa when Nagisa enrolls into high school a year after Haruka and Makoto. Not long after, Rin, who was thought to be in Australia, turns up and challenges Haruka to a race and wins.
Afterward, Nagisa suggests creating a swimming club and using the run-down outdoor pool. Haruka, Makoto, and Nagisa, and later on, Rin, create the Iwatobi High School Swimming Club and work together to make the club a success. Rin’s victory over Haruka means nothing to him as he realizes that Haruka had stopped swimming competitively and wasn’t in top shape. He claims that he cannot get over the fact until Haruka competes against him for real. The members of the revived Iwatobi Swim Club later enter a swimming competition against Rin.