Quick answer — Ryōta Komatsu and Charlie Kosei performed 1 anime theme, including "Kagen no Tsuki" from Mononoke.
Ryōta Komatsu and Charlie Kosei performed the anime theme songs "Kagen no Tsuki" (Mononoke).
Ryōta Komatsu and Charlie Kosei's first listed anime theme is "Kagen no Tsuki", the opening of Mononoke.