Figures Series
- ALL OUT!!
- Always 3 chome no Yuhi
- Occultic;Nine
- [Oshi no ko]
- Ookami kodomo no Ame to Yuki (Wolf Children)
- Touch Detective Mushroom Garden
- Please Tell Me! Galko-chan
- Osomatsu-san
- Ochikobore Fruits Tarte
- Otome Yokai Zakuro
- Onegai Twins
- Onegai Teacher (Please Teacher!)
- Onegai My Melody
- Opanchu Usagi
- Omamori Himari
- Ojamajo
- Onichan Dakedo Ai Sae Areba Kankeinaiyone
- Onimai: I'm Now Your Sister!
- The Angel Next Door Spoils Me Rotten
- Ookami-san Series
- Ozuma
- Orix Buffaloes
- ONGEKI
- Online Game
- Overman King-Gainer
- Overlord
- Otome wa Boku ni Koishiteru
- My Next Life as a Villainess: All Routes Lead to Doom!
- Ore, Twintail ni Narimasu.
- Special training in the Secret Dungeon
- Ore no Imoto ga Kon nani Kawaii wake ga nai
- Ore no Kanojo to Osananajimi ga Shuraba Sugiru
- Ore o Suki nano wa Omae dake kayo
- Okusama wa Maho Shojo
- Osananajimi ga zettai ni makenai love-come
- The Foolish Angel Dances with Demons
- Oshi ga Budokan Ittekuretara Shinu
- Ouran Koko Host Club
- Okami to Koshinryo (Wolf and Spice)
- Osama Ranking
- Seraph of the End
- Oda Nobuna no Yabou
- Odoru Daisosasen Series
- Onigamiden