Series List [O]
Popular Series List [O]
- ONE PIECE 120
- Onimusha 26
- ONI Series 22
- Okami 19
- Oretachi Geasen Zoku (Our Game Center Family) 25
- Othello (Reversi) 29
- Osomatsu-san 20
- OUT RUN 19
- Outer Wilds 12
- One: Kagayaku Kisetsu e 11
Series List [O]
- O*G*A Onigokko Royale
- O-Chan no Oekaki Logic
- O.to.i.Re: Dreamcast Sequencer
- OASIS ROAD
- Obake no Q-Taro
- OBAKEIDORO! (Bail or Jail)
- Obduction
- Obocchama-kun
- Oboro Muramasa (Muramasa: The Demon Blade)
- OCCULTIC;NINE
- Ocha-Ken
- Ochanoma Battle
- Ochige Designer Tsukutte pon!
- Ochige-Yarouze! Dengeki Construction
- Octopath Traveler
- Oda Nobunaga Den
- Oda Nobunaga Haou no Gundan
- Odama
- ODE TO THE SUNSET ERA
- Odekake Lester: Lelele no Le (Lester the Unlikely)
- Oden-kun
- Odin Sphere
- Odoru Daisosasen (Bayside Shakedown)
- Odoru Made in Wario (WarioWare: Smooth Moves)
- Oedo BlackSmith
- Oedo Fusui Ingaritsu: Hanabi
- Oedo Senryobako
- Oekaki Puzzle
- OEKAKI PUZZLE
- Off-World Interceptor
- Official Catalog
- Ogre Battle
- OH NO!
- OH! BAKYUUUN
- Oha Suta
- Ohanaya-san Monogatari
- Ohanaya-San Ni Narou!
- Ohimesama Debut (Princess Debut)
- Ohmono Black Bass Fishing
- Oide Rascal
- Oishinbo
- Ojamajo Doremi (Magical DoReMi)
- Ojarumaru (Prince Mackaroo)
- Ojou-sama Express
- Ojou-sama Kumikyoku
- Okada Toshio no Itsumade mo Debu to Omounayo
- Okami
- Okamiden: Chisaki Taiyou
- OKAPPARI-OH
- Okashi na Shima no Peter Pan: Sweet Never Land
- Okayu Nyumu!
- Okkotoshi Puzzle Tonjan!?
- Okuman Chouja Game
- Okuman Chouja Game: Nottori Daisakusen!
- Olivia's Mystery
- Olympia Soiree
- Olympic Gold
- Olympus no Tatakai (The Battle of Olympus)
- Omakase! Savers
- OMEGA 6 The Triangle Stars
- Omega Boost
- Omega Labyrinth Life
- Omega Quintet
- Omega Vampire
- Omerta ~Chinmoku no Okite~
- Omiai Command
- Omise de Tensyu
- Omizu no Hanamichi
- Omoi no Kakera: Close to
- Omoide Kakaete Ai ni Koi!!
- Omoikkiri Tanteidan
- OMORI
- ONE
- ONE PIECE
- ONE PIECE Grand Battle!
- ONE PIECE MANSION
- ONE PUNCH MAN
- One Step From Eden
- One: Kagayaku Kisetsu e
- OneChanbara
- Onegai Monster
- Onegai My Melody
- Ongaku Tsukuru
- Oni Ama -Watashi ni Amaete, Onii-chan-
- Oni II: Oni Densetsu
- Oni no Naku Kuni (Oninaki)
- ONI Series
- ONI TAIJI!!
- Oni V: Innin no Tsugumono
- Oni: Sora to Kaze no Aika
- Onigokko!
- Onimusha
- Onita Atsushi
- Only you
- Onmyou Taisenki
- Onna no ko to Misshitsu ni itara XX shichau kamoshirenai
- Onore no Shinzuru Michi wo Yuke
- Ontamarama
- Onyanko Town
- OoEdo Renaissance
- Ooita Beppu Mystery Annai Yuganda Take Tourou
- Ookami Kakushi
- Ookami to Koushinryou (Spice and Wolf)
- Ookiku
- Ookiku Furikabutte (Big Windup!)
- Opa-Opa
- Operation Abyss: New Tokyo Legacy
- Operation Darkness
- Operation Europe: Path to Victory
- Operation Flashpoint
- Operation Wolf
- OPERATOR’S SIDE
- Opoona
- Option TUNING CAR BATTLE.
- OPUS
- Oracle no Houseki (Jewels of the Oracle)
- Oraga Land Shusai: Best Farmer Shuukaku Sai
- Orange Honey
- Orange Pocket
- Ordyne
- Ore ga Omae o Mamoru
- Ore no Dungeon
- Ore no Imouto ga Konnani Kawaii Wake ga Nai (OreImo)
- Ore no Kanojo no Uraomote
- Ore no Ryouri
- Ore no Sentouki (Freedom Wings)
- Ore no Shikabane o Koete Yuke
- Ore no Shikabane wo Koeteyuke
- Ore no Shita de Agake
- Ore no Yacht: Ganbare Nippon Challenge
- Ore no Yome: Anata Dake no Hanayome
- Ore wa Shoujo Mangaka
- Ore-tachi ni Tsubasa wa Nai (We Without Wings)
- Oresama Kingdom (Kings of My Love)
- Oretachi Geasen Zoku (Our Game Center Family)
- Oretachi no Sabage
- Oretachi no Sekai wa Owatteiru. (Our World is Ended)
- Orfleurs
- orgarhythm
- Orgel
- ORGUSS
- Ori and the Will of the Wisps
- Oriental Blue: Ao no Tengai
- Osawagase! Penguin Boy (Amazing Penguin)
- Osawari Tantei: Ozawa Rina (Touch Detective)
- Oshaberi Inko Club
- Oshaberi Oumu
- Oshaberi Usagi Mechakawa Oshare Collection
- Oshare de Kawaii Koinu to Asobo!
- Oshare Majo Love and Berry (Love and Berry Dress Up and Dance!)
- Oshare na Koinu
- Oshare Princess
- Oshare Wanko
- Oshi no Love yori Koi no Love (OshiRabu: Waifus Over Husbandos)
- Oshigoto Theme Park
- Oshiri Kajiri Mushi (Bottom Biting Bug)
- Oshiri Tantei
- Osomatsu-kun
- Osomatsu-san
- Osouji Sentai Clean Keeper
- Osu! Tatakae! Ouendan (Elite Beat Agents)
- Osu!! Karate-bu (Go!! Karate Club)
- Otaku no Seiza: An Adventure in the Otaku Galaxy
- Otenami Haiken
- Otenki Kororin
- Othello (Reversi)
- Othello de Othello
- Other Life Azure Dreams
- Otoboke Ninja Colosseum
- Otocky
- Otogi Katsugeki Mameda no Bakeru: Oracle Saitarou no Sainan!!
- Otogi Story Tenshi no Shippo (Angel Tales)
- Otogi-Jushi Akazukin
- Otogi: Myth of Demons
- Otogibanashi Taisen
- Otogiriso
- Otoko no Tame no Bible The Yuujou Adventure -Hotaru Soul
- OTOKO YUKAKU
- Otome no Jijou
- Otome Riron to Sono Shuuhen: École de Paris
- Otome wa Boku ni Koishiteru
- Otomedius
- Otometeki Koi Kakumei Love Revo!!
- Otona no DS Kao Training
- Otona no DS Mystery Izumi Jiken File
- Otona no Jyoshiryoku Kentei
- Otona no Renai Shousetsu: Harlequin Selection
- Otonaryoku Kentei
- Otoshi Deka
- OTOSTAZ
- Otuge uranainandesu
- Ou to Maou to 7-nin no Himegimitachi
- Ougon no Kizuna
- Ougon no Taiyou (Golden Sun)
- Ouji-Sama Lv1
- Ouji-Sama Lv1.5
- Ouka
- Ouka Houshin
- Ouka Sabaki
- Ouka Sengoku!
- Oukoku no Grand Chef
- Ouma ga doki
- Ouma ga Toki
- Oumagatoki: Kaidan Romance
- Ouran High School Host Club
- Ousama Monogatari (Little King's Story)
- Out Live
- OUT RUN
- Out Run 2019
- Outburst (Raging Fighter)
- Outcast - A New Beginning
- Outer Wilds
- Outer World
- Outlaw
- Outlaw Golf
- Outlaw Volleyball
- OutRun
- Outtrigger
- Over G
- Over Horizon
- OVER REQUIEMZ
- OVER THE MONOCHROME RAINBOW
- OverBlood
- Overcooked
- Overdrivin' (The Need for Speed)
- Overlord: Escape From Nazarick
- Overlord: Maou Sama Fukkatsu no Toki
- Overpass
- Override (Last Battalion)
- Overwatch
- Owarai Yoiko no Geemumichi
- Owari no Seraph (Seraph of the End)
- Owaru Sekai to Birthday
- Oyaji no Jikan: Nee-chan Hanafuda de Shoubu Ya!
- Oyaji no Jikan: Nee-chan Tsuri Iku de!
- OZ
- Oz No Mahoutsukai: Another World-Rung Rung
- OZMAFIA!!