Groups
- oinko 8
- oiran ichimi 5
- oishii ko 6
- oishii oniku 9
- oishii oniku. 15
- oishii oshiri cafe 12
- oishii udon 34
- oishikattadesu. 1
- oiwaidou 27
- oiyoko 5
- oiz6 2
- oizumi 5
- oj 2
- oji-san no saifu 3
- ojiiya 9
- ojin koukoku 12
- ojmomo 14
- ojopie sentimental 19
- ojou no yokushitsu 6
- ok 2
- ok all right 2
- ok-2 1
- okachimentaiko 63
- okada shiori 1
- okada zari 1
- okadatei 80
- okaka 2
- okakachips 1
- okameinko shokudou 2
- okameya honpo 1
- okami kaikou 16
- okamoto gahaku 32
- okamoto nyohei 6
- okamu-land 2
- okano hajimetei 1
- okarutou 1
- okashi na denpa 16
- okashi no ie 1
- okashi senmonten 1
- okashi tai 68
- okashimo 26
- okatoraya 30
- okawari no mori 2
- okawaridonburi 1
- okaya 3
- okayu kyoushitsu 3
- okayushop 59
- okazu batake 1
- okazu club 15
- okazu company 17