| Oboreru Hanabi |
2009 |
2 |
- |
| Ocean Colored Polaris |
2018 |
1 |
- |
| Oh My God! |
2006 |
5 |
- |
| Ohayô! Spank |
1978 |
7 |
- |
| Ohisama Egao |
2000 |
1 |
- |
| Ohisama No Hana |
1998 |
1 |
- |
| Oishii Coffee No Irekata |
2019 |
3+ |
- |
| Oishii Kankei |
1993 |
16 |
- |
| Oishinbo |
1983 |
110+ |
- |
| Ôji No Hakobune |
2003 |
1 |
- |
| Ôji-sama Kôrin |
2010 |
1 |
- |
| Ojô To Banken-kun |
2018 |
2+ |
- |
| Ojōsama Gomeirei o |
2007 |
1 |
- |
| Okaeri Alice |
2020 |
1+ |
- |
| Ôkami Kakushi - Keshi Murasaki No Shô |
2009 |
3 |
- |
| Ôkami Shôjo Laura |
1992 |
1 |
- |
| Oku-sama wa Mahô Shôjo |
2005 |
3 |
- |
| Okujô No Bai-Bai |
2007 |
1 |
- |
| Old Boy |
1997 |
8 |
5.7 (3) |
| Old Boy (Edition Double) |
1997 |
4 |
- |
| Old Dog |
2014 |
2 |
- |
| Old Fashion Cupcake |
2019 |
2 |
- |
| Old Knight Bard Loen |
2016 |
9+ |
- |
| Oldman |
2013 |
4 |
- |
| Olympos |
2007 |
2 |
- |
| Omo Ni Naitemasu |
2010 |
10 |
- |
| Omoikkiri Nakeru Koi |
1999 |
1 |
- |
| On Air Dekinai! |
2017 |
1 |
- |
| Onaji Sora wo Mieteiru |
2011 |
1 |
- |
| Onani Master Kurosawa |
2005 |
4 |
9.8 (4) |
| Once Again |
2012 |
1 |
- |
| One |
1998 |
11 |
- |
| One Day |
2002 |
1 |
- |
| One Piece |
1997 |
100+ |
7.8 (14) |
| One Room Angel |
2019 |
1 |
- |
| Onegai Twins |
2005 |
1 |
- |
| Oneichan To Issho |
2004 |
5 |
- |
| Oni |
1997 |
1 |
- |
| Onikirimaru |
1991 |
20 |
- |
| Online - The Comic |
2013 |
10+ |
- |
| Only One |
2012 |
1 |
- |
| Only You - Tobenai Tsubasa |
1997 |
8 |
- |
| Onnanoko ga Shinu Hanashi |
2013 |
1 |
- |
| Ookami Heika No Hanayom |
2009 |
14+ |
- |
| Ookiku Furikabutte |
2004 |
26+ |
- |
| Open 24 hours a day |
2009 |
1 |
- |
| Opérations Dans Le Pacifique |
2013 |
1 |
- |
| Orange |
2006 |
1 |
5 (1) |
| Orange (Takano Ichigo) |
2012 |
6 |
- |
| Orange Bubble Gum |
2005 |
4+ |
- |
| Orange Lips |
2010 |
1 |
- |
| Orange Marmalade |
2011 |
8 |
- |
| Orange Yane no Chiisana Ie |
2005 |
8 |
- |
| Ore ni Koi Shite Dôsunda |
2007 |
1 |
- |
| Ore Ore |
2013 |
1 |
- |
| Ore Wo Suki Nano Wa Omae Dake Ka Yo |
2017 |
3+ |
- |
| Orera Kourin! |
2009 |
3 |
- |
| Oretachi Ni Ai Wa Nai |
2007 |
1 |
- |
| Origin |
2016 |
10 |
- |
| Orochi |
1969 |
4 |
- |
| Orpheus no Mado |
1975 |
18 |
- |
| Osagegami |
2012 |
1 |
- |
| Ōsamatachi No Viking |
2013 |
19 |
- |
| Osananajimi ga Zettai ni Makenai LoveCome |
2019 |
2+ |
- |
| Oshare Kozô wa Hanamaru |
1988 |
10 |
- |
| Oshi No Ko |
2020 |
10+ |
- |
| Oshiire |
1997 |
1 |
- |
| Othello |
2001 |
7 |
- |
| Othello |
2002 |
1 |
- |
| Otogi Taisen Fantasma |
2013 |
3 |
- |
| Otogizôshi |
2004 |
2 |
- |
| Otoko no Ko Dakara ne |
2003 |
1 |
- |
| Otoko Zaka |
1984 |
8+ |
- |
| Otome Sensô |
2013 |
12 |
- |
| Otomege Sekai wa Mob ni Kibishii Sekai Desu |
2018 |
7+ |
- |
| Otomegokoro |
2008 |
2 |
- |
| Otona no Mondai |
1997 |
1 |
- |
| Ou To Sokkin |
2011 |
1 |
- |
| Oudoumon |
2003 |
2 |
- |
| Our Colorful Days |
2018 |
1+ |
- |
| Our Little Secret |
2015 |
8 |
- |
| Our Summer Holiday |
2013 |
1 |
9 (1) |
| Our Summer Love |
2016 |
1 |
- |
| Ouroboros |
2009 |
15+ |
- |
| Outlaw Star |
1997 |
3 |
- |
| Outsiders |
2019 |
1+ |
- |
| Over Bleed |
2008 |
3 |
7.5 (2) |
| Over Time |
2006 |
3 |
- |
| Overman King Gainer |
2003 |
7 |
- |
| Overwhelming Them |
2002 |
5 |
- |
| Owaranai Koi no Tame ni |
1996 |
1 |
- |
| Oyasumi Scheherazade |
2018 |
4+ |
- |
| Ôyukiumi no Kaina |
2022 |
2+ |
- |
| Ozanari-kun |
2012 |
1 |
- |
| Pact |
2014 |
5 |
- |
| Paethon |
1988 |
1 |
- |
| Pai o Agemasho, Anata ni Pai o ne |
2012 |
1 |
- |
| Pajama na Kanojo |
2012 |
2+ |
- |
| Palais |
2002 |
27 |
- |
| Panda Detective Agency |
2018 |
1+ |
- |
