| Old Fashion Cupcake |
2019 |
2 |
- |
| Old West |
2018 |
1 |
- |
| Olympia Kyklos |
2018 |
4 |
- |
| Omae wa Mada Gunma wo Shiranai |
2013 |
8+ |
- |
| Omo Ni Naitemasu |
2010 |
10 |
- |
| Omoikkiri Nakeru Koi |
1999 |
1 |
- |
| Omuraisu |
1998 |
5 |
- |
| On Air Dekinai! |
2017 |
1 |
- |
| On The Frontier |
2016 |
1 |
- |
| On-Sight! |
2004 |
2 |
- |
| Onani Master Kurosawa |
2005 |
4 |
9.8 (4) |
| Once Again |
2012 |
1 |
- |
| One |
1998 |
11 |
- |
| One Day |
2002 |
1 |
- |
| One Room Angel |
2019 |
1 |
- |
| One Room, Hiatari Futsû, Tenshitsuki |
2020 |
6+ |
- |
| Onee-Chan Dorobô |
2007 |
1 |
- |
| Onee-chan ga Kita |
2010 |
2+ |
- |
| Onegai Kami-sama! |
2010 |
1 |
- |
| Oneichan To Issho |
2004 |
5 |
- |
| Oni |
1997 |
1 |
- |
| Onii-Chan Control |
2009 |
5 |
- |
| Onii-chan wa Oshimai! |
2017 |
1 |
- |
| Only Love |
2009 |
1 |
- |
| Only One |
2012 |
1 |
- |
| Onna No Ie |
2012 |
2+ |
- |
| Onna No Kataki Wa Onna |
1990 |
1 |
- |
| Ontama |
2009 |
2 |
- |
| Onzôshi No Otehodoki |
2012 |
1 |
- |
| Oogata Shinjin No Kyouikukei |
2015 |
1 |
- |
| Ookami Ni Kuchizuke |
2012 |
2 |
- |
| Ookamidomo No Shitsukekata |
2011 |
1 |
- |
| Ookiku Furikabutte |
2004 |
26+ |
- |
| Ootagawa Junjou Lovers |
2013 |
1 |
- |
| Opera-za de Mattete |
1990 |
1 |
- |
| Orange (Takano Ichigo) |
2012 |
6 |
- |
| Orange Bubble Gum |
2005 |
4+ |
- |
| Orange Delivery |
2004 |
4 |
- |
| Orange Lips |
2010 |
1 |
- |
| Orange Marmalade |
2011 |
8 |
- |
| Orange Yane no Chiisana Ie |
2005 |
8 |
- |
| Order Wa Boku De Yoroshii Desu Ka? |
2007 |
1 |
- |
| Ore Ga Ojô-Sama Gakkô Ni "Shomin Sample" Toshite Rachirareta Ken |
2012 |
9+ |
- |
| Ore No Ningyohime |
2015 |
1 |
- |
| Ore Ride!! |
2013 |
1 |
- |
| Ore Wo Suki Nano Wa Omae Dake Ka Yo |
2017 |
3+ |
- |
| Orenchi no Furo Jijō |
2011 |
8 |
- |
| Orera Kourin! |
2009 |
3 |
- |
| Oretachi Ni Ai Wa Nai |
2007 |
1 |
- |
| Orgueil Et Préjugés |
2014 |
1 |
- |
| Osagegami |
2012 |
1 |
- |
| Osaka Hamlet |
2006 |
3+ |
- |
| Osake Wa Fûfu Ni Natte Kara |
2015 |
6+ |
- |
| Osamu Tezuka - Une Vie En Manga |
2009 |
1 |
- |
| Oshare Kozô wa Hanamaru |
1988 |
10 |
- |
| Oshi No Ko |
2020 |
10+ |
- |
| Oshiete! Galko-chan |
2014 |
1 |
- |
| Oshiire |
1997 |
1 |
- |
| Oshikiri Rensuke Gekijou Masashi!! Ushiro da!! |
2005 |
1 |
- |
| Oshioki Ôji |
2012 |
1 |
- |
| Ōshitsu Kyōshi Heine |
2013 |
5+ |
- |
| Osomatsu-kun |
1962 |
34 |
- |
| Osomatsu-san |
2016 |
10 |
- |
| Otaku Club |
2007 |
1 |
- |
| Otaku Girls |
2006 |
7 |
8 (1) |
| Otaku no Musume-San |
2006 |
5+ |
- |
| Otaku Otaku |
2014 |
5+ |
- |
| Otenki Onesan |
1992 |
8 |
- |
| Othello |
2001 |
7 |
- |
| Othello |
2002 |
1 |
- |
| Othello (Otsu Hiyori) |
2011 |
1 |
- |
| Otoko no Ko Dakara ne |
2003 |
1 |
- |
| Otome Game |
2017 |
7+ |
- |
| Otome Ni Nante Naremasen |
2014 |
1 |
- |
| Otome No Teikoku |
2010 |
14+ |
- |
| Otome Ôji |
2008 |
1 |
- |
| Otome wa Boku ni Koishiteru: Futari no Elder |
2010 |
3 |
- |
| Otome Yôkai Zakuro |
2006 |
4+ |
- |
| Otomege Sekai wa Mob ni Kibishii Sekai Desu |
2018 |
7+ |
- |
| Otona no Mondai |
1997 |
1 |
- |
| Otonohako |
2008 |
1 |
- |
| Ottori Sôsa |
1996 |
10 |
- |
| Ouji To Houkago |
2010 |
1 |
- |
| Our Colorful Days |
2018 |
1+ |
- |
| Our Summer Love |
2016 |
1 |
- |
| Out (Mizuta Makoto) |
2012 |
15+ |
- |
| Over Time |
2006 |
3 |
- |
| Overwhelming Them |
2002 |
5 |
- |
| Owari to Hajimari no Mairusu |
2008 |
1+ |
- |
| Oyaji no Aijin to Kurasu Ore |
2014 |
3 |
- |
| Oyasumi Scheherazade |
2018 |
4+ |
- |
| Oz to Elza |
2015 |
2 |
- |
| Ozanari-kun |
2012 |
1 |
- |
| Oze Akira - Senshû |
1981 |
3 |
- |
| P-pan Kuru |
2008 |
1 |
- |
| Palais |
2002 |
27 |
- |
| Pan De Peace! |
2014 |
1+ |
- |
| Pan'Pan Panda, une vie en douceur |
2008 |
8 |
- |
| Pandora (Nemu Yoko) |
2010 |
1 |
- |
| Pandora no Kifujin |
1991 |
1 |
- |
