Momotaro Mikoshiba/Story

Free!-Eternal Summer-
In Free!-Eternal Summer-, Coach Sasabe plans to put on a swimming festival for the Iwatobi Swimming Club for children, asking Haruka Nanase 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 Matsuoka's team members is forced to drop out, but happen to run into Momotaro Mikoshiba, the younger brother of team captain Seijuro Mikoshiba, to fill in for him. An excellent backstroke swimmer he takes part in the relay. Both teams show strong form with Haruka's team managing a narrow win. Afterwards, Momotaro (or Momo, as he likes to be called) is invited to join the school team and he accepts.