Okusama wa Joshikousei
Olympia Kyklos
Omae wa Mada Gunma wo Shiranai
Omamori Himari
Onara Gorou
Onee-chan ga Kita
Onegai Teacher
Onegai Twins
One Outs
One Piece
One Punch Man
One Room
One Room, Hiatari Futsuu, Tenshi-tsuki.
Ongaku Shoujo
Onigiri
Onihei
Oniichan dakedo Ai sae Areba Kankeinai yo ne!
Oniichan no Koto Nanka Zenzen Suki Janain Dakara ne—!!
