Kisumi Shigino Edit
Hayato seems to depend and look up to his brother, Kisumi Shigino, who picks him up from his swimming lessons.
Makoto Tachibana Edit
He forms a bond with Makoto, who was his swimming instructor for a short period of time. Makoto pays special interest in Hayato because his fear of water reminds him of himself. Makoto teaches him to swim backstroke and Hayato seems deeply upset when Makoto has to leave.