One Room
Operation Han-Gyaku-Sei Million Arthur
Ouran High School Host Club
Outburst Dreamer Boys
Ore no Imouto ga Konnani Kawaii Wake ga Nai.: SD Chara ni Yoru Short Movie
Outbreak Company
Onimai: I'm Now Your Sister!
OniAi Specials
Oomuro-ke: Dear Friends
Ongaku Shoujo (TV)
Onyankopon
Onsen Yousei Hakone-chan