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(25) Episodes
Oban Star-Racers
Plot Summary: Eva's been hoping to hear from her dad for years. When she gets a part for her bike, she leaves school to find her dad-Don Wei. But right after she finds him the Earth team is off to race in the great race of Oban. Taking the name "Molly" Eva must prove that she can win-and make her dad recongize her.

(13) Episodes
Occult Academy
Plot Summary: The Waldstein Academy is an institute devoted to studies on paranormal disciplines, thus becoming known as the Occult Academy. Maya Kumashiro returns to this place to attend the funeral of the former principal, Junichiro Kumashiro, her father. Maya, a skeptic who hates the occult, meets Fumiaki Uchida, a time agent from the future sent to 1999 to prevent the apocalyptic Nostradamus Prophecies from happening. The predictions state that the school will be ground zero of the cataclysm that will destroy the world. They must team up to discover not only what actually led to her father's demise, they have limited time to find out what is the key that triggers the beginning of the end.
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(12) Episodes
Oda Nobuna no Yabou
Plot Summary: Ordinary high schooler Yoshiharu gets pulled into a time slip to the warring states period. There he meets Nobuna Oda - not Nobunaga, Nobuna. In this world, all the famous warlords of the era are female. Nobuna recruits Sagara, who she dubs "Monkey," to help her in her quest to rule the world.

(4) Episodes
Okane ga Nai
Plot Summary: Yukiya Ayase is a gentle, kind hearted, and innocent university student. The only relative he has left, his cousin Tetsuo, betrays Ayase by selling him to the highest bidder in an auction with hopes of making an enormous profit to be able to pay off his debts. Somuku Kanou, a bad-tempered (though very rich) loan shark, comes to Ayase's rescue and buys Ayase for an impressive 1.2 billion. Kanou apparently knows Ayase from something that happened between them in the past, but Ayase cannot remember who Kanou is nor does he understand why he "saved" him. In a desperate effort to keep Ayase close to him, Kanou demands the debt be repaid in full and suggests the perfect way to do it: by selling his body to Kanou for 500,000 each time. Ayase is horrified in the beginning, but something soon begins to grow between them that can't be bought for any price.

(12) Episodes
Omamori Himari
Plot Summary: The slapstick romantic comedy centers around an ordinary 16-year-old high school boy named Yūto Amakawa who is protected by a spirit — specifically, a beautiful, sword-wielding cat girl spirit named Himari. Yūto is descended from a family that has subjugated demons since time immemorial. The charm that once protected him is now impotent, but fortunately, at that same moment, Himari appears before him as his new guardian.

(21) Episodes
One Outs
Plot Summary: Hiromichi Kojima, the star batter of the Lycaons, heads to Okinawa to train and bring himself out of a slump. There, he meets Toua Tokuchi, a 134-kmph/83 mph pitcher and the undisputed king of a gambling form of baseball called "One Out." At Kojima's urging, Tokuchi signs up with the Lycaons. His contract differs form the usual, though, in that he gets 5,000,000 yen for every out he pitches, but loses 50,000,000 yen for every point he gives up.

(660) Episodes
ONE PIECE

(13) Episodes
Onegai Teacher
Plot Summary: Kusanagi Kei, a high-school student living with his aunt and uncle, has an encounter with a female alien. This alien is revealed to be a new teacher at his school. Later, he is forced to marry this alien to preserve her secrets. From there, various romantically-inclined problems crop up repeatedly.
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(12) Episodes
Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne

(11) Episodes
Onii-chan no Koto Nanka Zenzen Suki Janain Dakara ne!!
Plot Summary: Junior High student Nao's brother complex is so strong, it's almost at the point of incest. She's determined to make her brother, High School student Shuusuke, see her as a woman. So determined, that she goes as far as going into his room to throw away all his non-incest related porn. But as she's looking for his porno stash, she finds a photo album... and she's not in any of his childhood pictures.

(12) Episodes
Ookami Kakushi
Plot Summary: Kuzumi Hiroshi moves with his crippled sister and his father to the remote city of Jouga, which is famous for its hassaku citrus and the rumors that a species of enormous wolves once lived in the area. While some of the residents are more than friendly, when people begin to vanish suddenly, it becomes apparent that something sinister is afoot...

(12) Episodes
Ookami-san to Shichinin no Nakama-tachi
Plot Summary: A love comedy parodying fairy tales such as "Little Red Riding Hood," "The Ant and the Grasshopper," etc. Ookami Ryoko (Ookami-san) is a spunky high school girl. She is a member of a "fixer" club so called Otogi High School Bank. She fixes the school's problems with her partner Akai Ringo (Akazukin-chan.)

(39) Episodes
Ookiku Furikabutte Natsu no Taikai Hen
Plot Summary: Picking up where the original series left off, Ren Mihashi, the ace pitcher of the newly-formed Nishiura High School baseball team, and his teammates face the Sakitama High School team in the next round of the High School Baseball Invitational Tournament as they aim to play in the finals at legendary Hanshin Kōshien Stadium.
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(16) Episodes
Ore no Imouto ga Konnani Kawaii Wake ga Nai Season 2
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(13) Episodes
Ore no Kanojo to Osananajimi ga Shuraba Sugiru
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(10) Episodes
Ore no Nounai Sentakushi ga, Gakuen Love Comedy wo Zenryoku de Jama Shiteiru
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(24) Episodes
Oreca Battle

(11) Episodes
Oretachi ni Tsubasa wa Nai
Plot Summary: It's winter in the big city of Yanagihara, and young people will meet and fall in love. Takashi is a boy who plans to escape to another world, but is held back by thoughts of his younger sister Kobato and girlfriend Asuka. Shusuke is a poor part-timer who has to work with student-author Hiyoko in spite of their initial dislike for each other. The antisocial Hayato makes his living as a handyman until he is visited by a girl name Naru.

(26) Episodes
Otogiz?shi
Plot Summary: They are neither plants nor animals. They differ from other forms of life such as the micro-organisms and the fungi. Instead they resemble the primeval body of life and are generally known as "Mushi". Their existence and appearance are unknown to many and only a limited number of humans are aware of them. Ginko is a "Mushi-shi" who travels around to investigate and find out more about the "Mushi". In the process, he also lends a helping hand to people who face problems with supernatural occurances which may be related to the "Mushi".

(12) Episodes
Otome wa boku ni Koishiteru
Plot Summary: Mizuho, a young boy who has recently lost his grandfather, strives to obey his last wish—graduate from Seio, a private female-only school. In order to complete this last wish, Mizuho disguises himself as a female with some help from his childhood friend, Mariya and another Seio student, the wise Shion. Mizuho eventually meets two younger girls, Yukari and Kana, whom she and Mariya must mentor. He also meets an old rival of Mariya’s—the traditional Takako. Mizuho’s journey is filled with many obstacles including using feminine language, adhering to feminine behaviors and even competing in an election to school office.
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(2) Episodes
Otome wa Boku ni Koishiteru Futari no Elder
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(13) Episodes
Otome Yokai Zakuro
Plot Summary: In an alternate history of the Meiji era where humans and magical beings known as "yōnin" live side by side, half-yōnin girls team up with army lieutenants to fight yōnin wrongdoers.

(26) Episodes
Ouran High School Host Club
Plot Summary: Haruhi is a poor tomboyish student at a school for the ultra-wealthy, able to attend because of a scholarship, and unable to even afford a uniform. One day, she stumbles across the decidedly peculiar but very popular Ouran Host Club. She tries to leave, but accidentally breaks a vase, and unable to pay for it, she's told that she'll have to stay and do odd jobs. That is, until they decide she would be more valuable as a club member. Not realizing she's female due to her appearance, they fix her up and give her a male uniform. She's an instant hit, so they decide to have her keep up the charade even after they find out the truth. Haruhi, being average almost to a fault, doesn't know what to make of the unconventional activities of the Host Club (or of the even more unconventional members), but having little choice, she plays along. Before long, real bonds are formed, friends made, and Haruhi finds herself accepted in a way she could never have been otherwise in this affluent school.
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(12) Episodes
Outbreak Company

(26) Episodes
Outlaw Star
Plot Summary: Gene Starwind and his partner Jim Hawking run a small business on the backwater planet of Sentinel III. But all that changes the day that Hilda hires them for a bodyguard job. Now, thrust into a mystery they don't fully understand, they're on the run from the cops, the pirates, an angry alien, and a mysterious assassin. But they've got one thing going in their favor - they have the galaxy's most advanced ship, the Outlaw Star.

(26) Episodes
Overdrive
Plot Summary: Shinozaki Mikoto is a student who's life is really routine. Going to school, going home, going to school, going home...nothing changes....until the day the girl he likes talks to him and introduces him to bicycling. His life now has a new meaning, and a bright path has shown itself to Shinozaki. Experiencing both failure and success throughout his training, he works hard to become the best cyclist in the world.
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(6) Episodes
Ozuma
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