
Quick answer — Ryou Kunihiko worked on Yona of the Dawn OVA (Music), The Twelve Kingdoms (Music), Letter Bee Reverse (Music) and 3 more anime.
Ryou Kunihiko worked on Yona of the Dawn OVA (Music), The Twelve Kingdoms (Music), Letter Bee Reverse (Music), The Story of Saiunkoku (Music), Letter Bee (Music), Level E (Music).