Manga & Bunko Set Series Beginning with O
- [Oshi no ko]
- My Next Life as a Villainess: All Routes Lead to Doom!
- Oh-oku ( Danjo Gyakuten)
- Oishii Coffee no Irekata
- Okami Shojo to Kuro Oji
- Okane ga Nai!
- Okiku Furikabutte
- Omukaedesu.
- on BLUE Series
- One Piece
- One Punch Man
- Ooi! Tombo
- orange
- Ore monogatari!!
- Ore, Tsushima
- Oshiri Tantei
- Otaku ni Koi wa Muzukashii
- Otoyome Gatari
- Ouran Koko Host Club
- Oyasumi Punpun
- Seraph of the End
- Shomin Sample
- Uncle from Another World