Music Series
- ALL OUT!!
- Always 3 chome no Yuhi
- Occultic;Nine
- Oh, My Dad!!
- Ol Nippon
- orange
- Otakara File
- Over 30
- Over Drive
- [Oshi no ko]
- Oishii Gohan
- Oishii Coffee no Irekata
- Oishi Propose
- Ookami kodomo no Ame to Yuki (Wolf Children)
- Okiku Furikabutte
- Okasan to Issho
- Okaeri Mone
- Treat of Reincarnation
- Okoshiyasu Chitose Chan
- Curious George
- Touch Detective Mushroom Garden
- Ojiisan Sensei
- Ojisan Ha Kawai I Mono Ga Osuki.
- Ojarumaru
- Osen
- Osomatsu-san
- Ochoyan
- Ossan's Love
- Onegai My Melody
- Ohisama
- Ohitori sama
- Omiyasan
- Only Yesterday
- Onna Joshu Naotora
- Ojamajo
- Otome-San
- Onimai: I'm Now Your Sister!
- Omae wa mada Gunma wo shiranai
- Otenki One-san
- My Fair Lady
- A Girl & Her Guard Dog
- Oka-san Musume wo Yameteiidesuka?
- Otosan to Yobasete
- Omukaedesu.
- Osake wa Fufu ni Nattekara
- Okami Shojo to Kuro Oji
- Octave
- Ozuma
- Otoca Doll
- Otoko no Kosodate
- Otona Joshi
- Otona Koukou
- Ori Sta
- Orix Buffaloes
- Orustak Pictures
- Orthros no Inu
- Ore no Koto Sukidesho
- Orenchi no Furo Jijyo
- Online Game
- Oh! My Girl!!
- Overlord
- All In
- Omo ni Naiteimasu
- Otokomeshi
- Ore, Twintail ni Narimasu.
- Ore Ga Sukina No Ha Imotodakedo Imoto Janai
- Solo Leveling
- 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 no Sora Series
- Ore no nonai sentakushi ga gakuen Love comedy wo Zenryoku de Jyama Shiteiru
- Ore no Hanashi wa Nagai
- Ore o Suki nano wa Omae dake kayo
- Ore monogatari!!
- Otona no Kagaku Magazine
- Oh-oku / Ooku
- Oh-oku ( Danjo Gyakuten)
- Ohoka Echizen
- Oedo Rocket
- Tenkuu Shinpan
- Husband's lover
- Onna Kudoki Meshi
- Onna wa sore wo yurusanai
- Onna Keiji Mizuki
- Onosaka, Konishi no O+K(OTASUKE)
- Omoi, Omoware, Furi, Furare
- Omoide no Marnie (When Marnie Was There)
- Okitegami Kyoko Series
- Ouran Koko Host Club
- Onsen he Go!
- Onsen Yosei Hakone-Chan
- Okami to Koshinryo (Wolf and Spice)
- KING OF BANDIT JING
- The Royal Tutor (Oshitsu Kyoshi Haine)
- Osama Game
- Osama Ranking
- Royal Space Force - The Wings of Honneamise
- Otokotachi no Yamato
- Otoko wa Tsuraiyo