Groups
- ultimate safaripark 1
- ultra boss 1
- ultra hemoglobin 1
- ultra maniax 1
- ultra panic ero factor 1
- ultra radical fullpower 1
- uma no are 1
- umakatei 1
- umakoi 1
- umaku ikanai 1
- umakuienai 1
- umanami shobou 1
- umanicom 1
- umbrella.corp 1
- ume-turu 1
- umeboshi daikoushin 1
- umekonbutya 1
- umi no sachi teishoku 1
- umibe 1
- uminoya 1
- umio kyuuban 1
- unabara 1
- unagi 1
- unagi academy 1
- uncensoredheart 1
- unco mura 1
- uncomfortable chair 1
- under the bed 1
- ungrofish yakkyoku 1
- unicchu 1
- unicornic 1
- union 1
- unisen 1
- unit-rb 1
- unitone 1
- universal quantification 1
- universe 1
- unk.lab 1
- unkoya 1
- unn slash a 1
- unnunkannun 1
- unsung 1
- unubore 1
- unwonted studios 1
- unzip 1
- uonome tanteidan 1
- up1008 1
- uppupunsupe 1
- ura bou 1
- ura child 1