Yoshimasa Hosoya (細谷 佳正 Hosoya Yoshimasa) is a Japanese voice actor from Hiroshima, Japan. He is affiliated with Mausu Promotion. He is also a member of the pop duo MaxBoys along with Toshiki Masuda, a fellow Japanese voice actor.
In early 2017, Hosoya went on hiatus from voice acting to undergo treatment for his throat, but was able to resume work by August of the same year. However, he has since limited his singing roles, which is likely the reason for Sosuke not appearing in any new character or group songs on the recent character albums.