
Quick answer — Ryou Sakai worked on Kino's Journey (Music), Kino no Tabi: the Beautiful World - Byouki no Kuni: For You (Music), Kino no Tabi: Nanika wo Suru Tame ni -life goes on.- (Music) and 2 more anime.
Ryou Sakai worked on Kino's Journey (Music), Kino no Tabi: the Beautiful World - Byouki no Kuni: For You (Music), Kino no Tabi: Nanika wo Suru Tame ni -life goes on.- (Music), Ceres, Celestial Legend (Music), Maburaho (Music).