OVA
Lucky☆Star: Original na Visual to Animation
The OVA features six separate stories revolving around the cast, some of which border on the bizarre; one of which is an MMORPG environment being played by Konata, Kagami, Tsukasa, and Nanako Kuroi, and another in which Kagami has a "suggestive" dream about Konata.
(Source: Wikipedia)
Ova
Winter 2008
7.8
Mahoutsukai Tai!
One sunny day invaders came from space. They weren't little green men or funny girls wearing school uniforms, though. They were ugly robots which defeated the UN forces in seconds. After that the invaders (known as "eyeballs") roamed around and observed human society. In fact, they were peaceful unless attacked. They were polite and followed all the traffic laws, too. Still, they were aliens and the people of Earth wanted them to go home. The Kitanohashi High School Magic Club took it on themselves to defeat these foul robots and free the world.
(Source: ANN)
Ova
Winter 1996
7.02
Mai-Otome Zwei
My-Otome Zwei takes place one year after the events of My-Otome. Arika is now a full-fledged Otome (though still under the tutelage of Miss Maria) and Nagi is incarcerated in a prison somewhere in Aries. The various nations are at peace with one another and plan to hold S.O.L.T. (Strategic Otome Limitation Talks) to discuss limiting the numbers of Otome.
A mission to destroy a meteor threatening to collide with Earl sets into motion a chain of events which result in a mysterious shadowy figure attacking Garderobe and several Otome as well as a new, more powerful version of Slave appearing across the planet. To make matters worse, Queen Mashiro disappears following an argument with Arika. The series follows Arika's search for Mashiro as well as Garderobe's attempts to uncover the truth behind the shadowy figure.
(Source: Wikipedia)
Ova
Winter 2006
7.23
Majokko Club Yoningumi: A Kuukan kara no Alien X
Yuu, Persia, Mai and Yumi are together in a science fiction-like adventure. An awful monster assault young and beautiful girls, leaving them transformed into ugly hags: only our four magical girls with their powers can fly to the space and fight for Earth 's sake, so Yuu transforms into Creamy Mami, Mai into Magical Emi, Persia into Fairy and little Yumi draws space suits for all of them.
(Source: ANN)
Ova
Winter 1987
5.62
Maken-Ki! OVA
Ova
Winter 2012
Mayonaka no Occult Koumuin OVA
Ova
Winter 2019
Mayonaka no Occult Koumuin: Fukurokouji to Ano Ko to Ore to
Ova
Winter 2019
Minami-ke Betsubara
Ova
Winter 2009
Minami-ke Natsuyasumi
Ova
Winter 2013
Minami-ke Omatase
Ova
Winter 2012
Mondaiji-tachi ga Isekai kara Kuru Sou desu yo?: Onsen Manyuuki
Ova
Winter 2013
Monster Musume no Iru Nichijou OVA
Ova
Winter 2016
Nazo no Kanojo X: Nazo no Natsu Matsuri
Ova
Winter 2012
Nekopara OVA
Ova
Winter 2017
New Game! Watashi, Shain Ryokou tte Hajimete nanode...
Ova
Winter 2017
Nichijou: Nichijou no 0-wa
Ova
Winter 2011
Nodame Cantabile OVA
Ova
Winter 2009
Nogizaka Haruka no Himitsu Finale ♪
Ova
Winter 2012
Non Non Biyori Nonstop: Bukatsu wo Ganbatta
Ova
Winter 2022
Non Non Biyori Repeat: Hotaru ga Tanoshinda
Ova
Winter 2016
Non Non Biyori: Okinawa e Ikukoto ni Natta
Ova
Winter 2014
Nurse Witch Komugi-chan Magikarte
Ova
Winter 2002
Nurse Witch Komugi-chan Magikarte Z
Ova
Winter 2004
Onegai☆Teacher: Himitsu na Futari
Ova
Winter 2002
Onegai☆Twins: Natsu wa Owaranai
Ova
Winter 2004
Ore wo Suki nano wa Omae dake ka yo: Oretachi no Game Set
Ova
Winter 2020
Oshiete! Galko-chan: Natsuyasumi tte Hontou desu ka?
Ova
Winter 2017
Overlord: Ple Ple Pleiades - Nazarick Saidai no Kiki
Ova
Winter 2016
Owari no Seraph: Kyuuketsuki Shahar
Ova
Winter 2016
Rinne no Lagrange: Kamogawa Days
Ova
Winter 2012
Rokushin Gattai GodMars: Juunana-sai no Densetsu
Ova
Winter 1988
School Days: Magical Heart Kokoro-chan
Ova
Winter 2008