Groups
- otentomaru 25
- otete 5
- oteyawarakani 1
- othello ice 128
- otherwise 2
- othukimi 58
- otiba 7
- otimpons 4
- otinpop 5
- otn koukoku 10
- otnk 3
- oto 6
- otobokechasoba 1
- otochilu cafe 7
- otocinq 1
- otofu fire 2
- otofubarricade 5
- otofuhonpo 3
- otogi no kuni no soapland 46
- otogidou 6
- otogiya 53
- otohikoboshi 1
- otohime 124
- otohime 49-gou 19
- otohime-dou 1
- otohimedou 20
- otoko doushi 1
- otoko no roman 13
- otoko no saimin fetiya-san 55
- otoko-jyuku 1
- otokodama 16
- otokogumo 1
- otokojuku 67
- otokonoko club 16
- otokonoko club z 1
- otokonoko daisuki iinchou 30
- otokonoko de asobou 82
- otokonoko fantasy club 4
- otokonoko heaven 3
- otokonoko koubou 1
- otokonoko soft 29
- otokonoko tankyuu iinkai 3
- otokonoko to onnanoko 32
- otokozaka onnazaka 1
- otomari club 10
- otome half line 1
- otome no eden 7
- otome plus 6
- otome rinna 1
- otomekibun 200