Haruka Nanase and Rin Matsuoka are both gifted swimmers who are friends, but fierce rivals in the pool; their lives and the lives of their friends are chronicled as they compete alongside and against one another.

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At Samezuka Academy, the hot-blooded practices continue ahead of regionals; meanwhile, the Iwatobi Swim Club trains diligently each day until sundown; though Amakata-sensei is concerned, Haruka and the boys insist they want to practice.
As the tournament continues, Sousuke tells Rin about how he's past their years of separation; Rin is concerned at Sousuke's nonchalant attitude toward certain things and tries to speak his mind.
The Iwatobi Swim Club continues their training; however, signs of confusion seem to keep surfacing in Haruka's swimming; Makoto and the others are worried about him, but try to continue acting cheerfully, as though nothing was wrong.
Upon Rin's invitation, Haruka finds himself venturing to a certain country; knowing that Haruka has hit a wall worrying about his future, Rin opens up and speaks to him about his own thoughts and feelings.