Groups
- oobeya potechi house 1
- oochii 1
- ookami no o 1
- oomi tsutou 1
- oomori bakujou 1
- oono satoshi 1
- oooa 1
- ooooo 1
- ooparts 1
- ootomo sawako 1
- op88 1
- opalescence 1
- open heart 1
- open mind 1
- operation 1
- oppai ga ippai 1
- oppai kikaku 1
- optimist 1
- optimistic 1
- opuntia 1
- oqizome 1
- orabgeta 1
- oracion 1
- orange doll 1
- orange love 1
- orange lovers 1
- orange milk donuts 1
- orange pink 1
- orange pulque 1
- orange screw bourbon 1
- orange star 1
- orangebox 1
- orangecafe 1
- orangekiss 1
- ore no genba 1
- ore no shushoku wo shiritaika 1
- orenchi choutokkyuu 1
- oresama memorial 1
- oretachi tensai 1
- orgone box 1
- oriana 1
- orihime-bunko 1
- orimidoro 1
- oritonagi 1
- ornament 1
- osakana ichiba 1
- osakanaichiba 1
- osakanaya-san 1
- osatou 1
- oshiire no naka 1