
Quick answer — Kouhei Mitoma voices Yoshihiko Ochi in The Fruit of Grisaia, Shunsuke Nakata in Grandpa and Grandma Turn Young Again.
Kouhei Mitoma voices Yoshihiko Ochi (The Fruit of Grisaia), Shunsuke Nakata (Grandpa and Grandma Turn Young Again).
Yoshihiko Ochi is voiced in Japanese by Kouhei Mitoma.