Rin Matsuokaâs childhood friend, Sousuke Yamazaki, has recently transferred to Samezuka Academy. Upon their reunion, the two reminisce about their childhood days and reaffirm their wish to swim together. Now with Rin, Sousuke, Captain Mikoshibaâs younger brother Momotarou Mikoshiba, and hard-working Aiichirou Nitori, the Samezuka relay team is formed, and their friendship deepens. However, as tournaments, races, and training go on, the reason for Sousukeâs sudden return begins to trouble him and affect his swimming. Noticing Sousukeâs change, Rin pushes to uncover what is holding him back.