O

1
PG-13

Oira Sukeban

Does being the only guy in an all girl school sound like paradise? It might be, if the girls knew you were a guy, but to stay in school teenage pervert Banji can't let can't let anyone find out his chromosomes don't match. Banji's status conscious parents want him to go to a good school, but not enough to spend the money on a good co-ed school. Now, in addition to studying math and science, Banji has to learn how to put on a bra and makeup. His life has become a living hell. Not only is he at the bottom of the social pecking order, he must also got to conceal his inner-masculinity from the pretty classmate girl who's stolen his heart while avoiding the female bullies who threaten to expose his less-than-feminine charms in the locker room. (Source: ANN)
Ova Winter 1992 5.21
3
R+

Okama Hakusho

Okama is a man who has some problems. First off, his name means 'gay' in Japanese. Next, he has the hots for himself dressed as a girl. Finally, he ends up working at a transvestite bar where he has befriended a girl named Miki. This is not an easy matter to solve, because she only knows him as his female counterpart named Catherine. So how is a guy dressed as a girl supposed to come out to a girl as a heterosexual male? To make matters worse, she has a boyfriend who is trying everything in the book to get with her. Enter the exciting world of Okama Hakusho where love comes in many different flavors!
Ova Winter 1991 5.86
13
G

Ojamajo Doremi Na-i-sho

Na-i-sho is a 13 episode OAV series detailing the summer between the ~motto~ and the Dokkaan season. It is a bit more mature than the TV seasons, and looks to develop each of the five witches romantically. Hana is back to a baby, and the mahou shop is a bakery. (Source: ANN)
Ova Winter 2004 7.82
1
PG-13

Oedo wa Nemurenai!

We are now in the early 18th century, the Kyouhou era, when the merchant culture was flourishing. In Yoshiwara, the red light district of Edo, there is a popular courtesan with good looks and character, called Usugumo. She in fact is a daughter of a Christianized prostitute and Tokugawa Yoshimune (who was a real historical character and the 8th Shogun of Japan), but the power struggle in these times doesn't allow her to be with her father. Her fate is about to change when she meets the blond haired thief, Kikunosuke. With Kikunosuke, a doctor named Aoto Touichirou, who uses the yet unfamiliar Western medicine, and her pet cat, Kotetsu, Usugumo forms a thief group, the Kikugumi. In the meanwhile, a member of a mysterious group appears, aiming for Usugumo... (Source: AniDB)
Ova Winter 1993 5.43
R
4
6.65

Osu!! Karate-bu

Ova Winter 1990
Rx
3

Otokogi

Ova Winter 1990
Rx
2
7.12

Otaku no Video

Ova Winter 1991
PG-13
1
5.76

Oval x Over

Movie Winter 2005
R
4
6.21

Onikirimaru

Ova Winter 1994
R
6
7.7

One Punch Man Specials

Special Winter 2015
PG-13
1
7.39

Osomatsu-san Special

Special Winter 2016
PG-13
2
7.05
R
4
7.36
PG-13
1
6.48

Omoi no Kakera

TV Winter 2016
R
6
7.4
PG-13
2
6.31
PG-13
4
6.22
R
1
7.22
PG-13
12
6.5

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