Okusama ga Seitokaichou!
Okusama wa Joshikousei
Okusama wa Mahou Shoujo
Olympia Kyklos
Omae wa Mada Gunma wo Shiranai
Omamori Himari
Onara Gorou
Onee-chan ga Kita
Onegai My Melody
Onegai Teacher
Onegai Twins
One Off
One Outs
One Piece
One Punch Man
One Room
One Room, Hiatari Futsuu, Tenshi-tsuki.
Ongaku Shoujo
