[PART 1] Matsuoka Rin is a retired Olympian who failed to win the medal he so longed for and has retreated in disgrace to become a coach at his hometown swim club. There, he meets the club’s ace–12-year-old Nanase Haruka–and decides to help Haruka realize his potential and do what Rin never could.

[PART 2] In “Winter Tales”, Haruka has accepted his place as Rin’s pupil and is training as requested, but problems at home that are starting to affect that training prompt Rin to take action.

[PART 3] Rin takes Haru to the Junior Olympic Cup in Tokyo, and together they make waves.