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Goro plans to put on a swimming festival for the Iwatobi Swimming Club for children, asking Haruka and the others to spread word and come up with a main event, with Haruka suggesting a relay event. On the day of the event, one of Rin's team member is forced to drop out, but they manage to find the former team captain's brother, Momotarou Mikoshiba, to fill in for him. As the relay gets underway, both teams show strong form with Haruka's team narrowly managing to win. Afterwards, Rin invites Momotarou to join his swim club and he does.