The story revolving around Haruka Nanase
– a boy to whom nothing is dearer than swimming, diving, and water – tells of him and his Swim Club collegues Makoto Tachibana
, Nagisa Hazuki
and Rin Matsuoka
. They founded a Swim Club before arriving at the end of their elementary school time to participate in a tournament and after winning it, they went about their separate ways.
Some time has passed and their high school days are going by rather unspectacularly, when suddenly Rin reappears to challange Haruka to a swim duel, where he completely overpowers Haruka. To get back at Rin, Haruka founds a new Swim Club with his old buddies Makoto and Nagisa, and the new member, Rei Ryugazaki.
The story revolves around Haruka Nanase, a boy who has always loved to be immersed in water, and to swim in it. Before graduating from elementary school, he participated in a swimming tournament along with his fellow swimming club members, Makoto Tachibana, Nagisa Hazuki, and Rin Matsuoka. After achieving victory, each of the boys went their separate ways.
Time passed, and in the middle of their uneventful high school lives Rin appears and challenges Haruka to a match, showing Haruka his overwhelming power. Not wanting it to end like this, Haruka, gathers together Makoto and Nagisa once again and brings a new member named Rei Ryugazaki to create the Iwatobi High School Swimming Club in order to defeat Rin.
When Haruka, Makoto, Nagisa and Rin were in elementary school, they swam together in a relay race and won the match. As Rin was on his way to Australia to train to become an Olympic champion, the gang decided to bury their trophy in a time capsule and retrieve it when they all had grown up. Now, Haruka, Makoto and Nagisa have reunited in high school and decide to dig up the prize. But on the way there, they run into none other than Rin, and he’s determined to show Haru who’s the best! As a result of this fateful meeting, the three friends decide to start a swim club, along with fellow classmate Rei, and their rival’s little sister Gou as the team manager. Can the gang hold their own against Rin and prove their skills at the Prefectural Tournament?