Matsutaro Yoshimatsu (吉松 松太郎 Yoshimatsu Matsutarō) was a surfer and artist from Yokohama. He worked with wire art and hoped to study in Rome, Italy. His girlfriend, Rika broke up with him in a small fishing village, where he waited until she returned.
Matsutaro grew up in Yokohama and attended school there with his future girlfriend, Rika. Having aspirations to be an artist, he applied to an art school and failed. Disappointed by his failure, Matsutaro began working odd-jobs, which frustrated Rika. One day, the two visited a small fishing village, where Rika declared "I can't put up with you any longer" and left him.
Matsutaro has long, dark hair that reaches his shoulders. Tsukushi describes him as "tall [and] sort-of good looking".