Zodiac:
Aquarius

Swim Style:
Butterfly (specialty), breaststroke, individual medley

The rival swimmer from Sametsuka Academy. Rin Matsuoka is Haruka's rival who is also in 11th grade. He had gone abroad to study swimming, but his personality changed immensely by the time he had returned to Japan and for this reason he often perplexes his former teammates. Rin goes to all-boys school.