Seinen เซ็นเน็น

Oretama (My Balls)

Ori no Naka no Soloist

Oriental Clinic Miracles

Origin

Oritsu Maho Gakuen no Saika-sei~ Hinkon-gai (Suramu) Agari no Saikyo Maho-Shi, Kizoku-darake no Gakuen de Muso Suru~

Oroka na Tenshi wa Akuma to Odoru

Osaka

Osaka Madam, Koukyuu-hi ni Naru!

Osananajimi Kanojo no Morahara ga Hidoin de Zetsuen Sengen shite Yatta

Osananajimi ni najimitai

Osen

Oshi no Ko

Oshi V ga Oshiego de Watashi ga Mama de!?

Otome Monster Caramelize

Otome no Teikoku

Ottoman

Oukoku e Tsuzuku Michi – Dorei Kenshi no Nariagari Eiyuutan

Our Complication

Outreijou

Over Rev!

Overly Ferocious of Being Cautious

Overpowered Healer

Oyasumi Punpun

Paladin

Parabellum

Paradise Hell

Parallel Paradise

Pashiri na Boku to Koi suru Banchou-san

Past Life Returner

PC Goddess Room