Shounen

Nozomanu Fushi no Boukensha

Obsessive Romance

Octagon Revenge

Oda nobunaga to iu nazo no shokugyou ga mahou kenshi yori chiitodattanode, oukoku o tsukuru koto ni shimashita

Ogami Tsumiki to Kinichijou.

Ojousama no Shimobe

Okaeri Alice

Okuru Kotoba

Okyu no Trinity

Omniscient Cultivator

Omniscient Reader’s Viewpoint

One Piece

One Piece: Ace Story

One Piece: Log Book Omake

One Step to The Demon King

One-Armed Amy

One-Room Hero

One’s In-Laws Virgins

Onee-san is Invading!?

Ookami Shounen wa Kyou mo Uso o Kasaneru

OOPARTS

Open Talk

Ore da Mada Honki o Dashite Inai

Ore Dake Haireru Kakushi Dungeon: Kossori Kitaete Sekai Saikyou

Ore no Genjitsu wa Ren’ai Game?? ka to Omottara Inochigake no Game datta

Ore no Imouto ga Konna ni Kawaii wake ga nai Kuroneko IF

Ore No Kanojo Ga Mangakka Ni Naru

Ore No Zense No Chishiki De Teihengyo Tamer Ga Joukyugyo Ni Natte Shimaisou Na Ken Ni Tsuite

Ore wa Inu Dewa Arimasen!

Ore wa Subete wo “Parry” Suru

OreAku, Ore wa Seikan Kokka no Akutoku Ryoushu!

Orenchi ni Kita Onna Kishi to: Inakagurashi suru Koto ni Natta Ken

Orient

Osananajimi ga Mamasugite Tsurai

Osananajimi no Mune ga Ookiku natta no wa Ore no sei ka mo shirenai

Osananajimi To Wa Rabukome Ni Naranai

Osasete! My Teacher

Oshi ga Imouto Ni Narimashite.

Oshi ga Kounin Sutouka ni Narimashita

Ossan, Yuusha to Maou wo Hirou

Otome Bare

Otome Game Sekai wa Mob ni Kibishii Sekai Desu

Oumagadoki Zoo

Our Exchange

Outsider: The Invisible Man

Overclockers

Overgeared

Owari no Seraph

Pajama na Kanojo.

Panlong