Orange
Overlord: The Dark Hero
Overlord: Ple Ple Pleiades - Nazarick Saidai no Kiki
Overlord: The Sacred Kingdom
Orient: Awajishima Gekitou-hen
Operation Han-Gyaku-Sei Million Arthur
Onmyo Kaiten Re:Birth Verse
Opus.COLORs
Overlord: Ple Ple Pleiades 3
Our Last Crusade or the Rise of a New World
Onihei
Overlord II