Music Series
- ALL OUT!!
- Always 3 chome no Yuhi
- [Oshi no ko]
- Ookami kodomo no Ame to Yuki (Wolf Children)
- Okasan to Issho
- Treat of Reincarnation
- Curious George
- Touch Detective Mushroom Garden
- Osen
- Osomatsu-san
- Ossan's Love
- Onegai My Melody
- Only Yesterday
- Ojamajo
- Onimai: I'm Now Your Sister!
- Otoca Doll
- Orix Buffaloes
- Online Game
- Overlord
- Solo Leveling
- Ore no Imoto ga Kon nani Kawaii wake ga nai
- Ohoka Echizen
- Omoi, Omoware, Furi, Furare
- Omoide no Marnie (When Marnie Was There)
- Okitegami Kyoko Series
- Ouran Koko Host Club
- Okami to Koshinryo (Wolf and Spice)
- The Royal Tutor (Oshitsu Kyoshi Haine)
- Seraph of the End
- Odoru Daisosasen Series