OVA Anime
Nozo x Kimi
Suga Kimio finds himself hiding in the girls locker room, unable to move or escape the situation as the girls in his school crowd in. Although he originally had no ulterior motives, he found himself panicking as he heard the girls coming in and hid in a locker. Komine Nozomi, one of the shy girls in his class finds him, but surprisingly covers for him. Perplexed but glad, Kimio goes home.
Later that night, he gets a text from Nozomi who happens to live across the way on the same floor of the complex they both live in. She blackmails him into agreeing to show each other's bodies when she texts him. Kimio has to abide by Nozomi's insane demands or risk ruining his school life so they both start their little peep show through each other's windows...
(Source: MangaHelpers)
Kidou Senshi Gundam: THE ORIGIN
In the year 0068 of the Universal Century, Casval Rem Deikun's life is thrown into chaotic disarray after the assassination of his father, a prolific figure in the crusade towards civil rights for people who live away from the Earth's surface. Casval and his sister Artesia receive aid from soldiers who were loyal to their father, and the siblings are whisked away from their home, separated, and thrown into a twisted fate that sees them come into their own as soldiers and adults.
Years before stealing the name Char Aznable or his "Red Comet" moniker, Casval must contend with the rise of a militarized version of his father's ideology and his own vengeful nature as intergalactic war molds him into a legendary mobile suit pilot.
(Source: MAL Rewrite)
Seto no Hanayome OVA
The OVAs are new stand alone shorts with characters from the series and introduces two new ones. It is now the third year of school, San and Luna's dads are still being over protective. All the while Nagasumi has his hands full trying to keep everyone around him under control and rescuing damsels in distress.
(Source: Anime News Network)
Koyomi History
Adaptation of the Koyomi History short story, released in the Madogatari blu-ray.
Watashi ni Tenshi ga Maiorita! OVA
Hinata Hoshino, Hana Shirosaki, and Noa Himesaka are off to the countryside for a camping trip. At Hinata's behest, her elder sister, Miyako, reluctantly tags along. Seeing how gloomy Miyako is, the trio do their best to get her to enjoy herself too.
Besides the camping trip, Watashi ni Tenshi ga Maiorita! OVA contains three more short stories of the girls. Although their lives seem normal, one thing is certain: there is definitely no shortage of cuteness here!
(Source: MAL Rewrite)
Tsubasa: Tokyo Revelations
Continuing their journey from Record Country (the place that held the book of memories), Syaoran and company land into Tokyo Country, a blood-filled country under war from opposing factions for natural resources and survival. While reluctantly involved in the race to live, the group faces their own problems as certain revelations are made, changing their journey forever.
A shocking betrayal and a battle that risks all of their lives. After this revelation, they will never be the same again.
(Source: MAL)
Uchi no Maid ga Uzasugiru! OVA
Included with the 4th volume of the Blu-ray/DVD release
Papa no Iukoto wo Kikinasai! OVA
Limited edition episode included with pre-orders for the 13th and 18th light novel volumes.
Carnival Phantasm EX Season
A DVD-only episode bundled with the special edition Take Moon volume.
Caren Ortensia attempts to control the world using money with varying degrees of success, Phantas-Moon receives a movie adaption of her T.V. show, and Shiki is involved in a love plot that spans years.
(Source: Wikipedia)
Astarotte no Omocha! EX
The OVA Astaroette no Omocha is a three part short story series. In the first story, Lotte and Asuha find themselves searching for details about their school project. In the second bit, is the backstory to how Zelda came to be Lotte's bodyguard. The final of the three, is a flashback of how the queen met Naoya and how they conceived Asuha ten years prior to the events in the anime.
(Source: Anime News Network)
Kuroko no Basket: Mou Ikkai Yarimasen ka
Bundled with the sixth Blu-ray/DVD. Episode "41.5 Quarter" will adapt the 124th chapter from the manga, which depicts when Kuroko and Aomine met.
Kekkai Sensen & BEYOND OVA
Bundled with the 5th volume of the Kekkai Sensen: Back 2 Back manga
The OVA, which will have a duration of 24 minutes, will adapt two stories. The first story titled "Zapp Renfro Inga Oohou-juu!!" will adapt a chapter from volume four, while the second story, titled "Bakkaadio no Shizuku," will adapt a chapter from volume two.
(Source: AniList.co)
Isuca: Gokuraku
An OVA bundled with the 7th volume of the manga. Includes a beach episode.
Yama no Susume: Omoide Present
On the final day of summer vacation, Kokona Aoba is ready to spend some long-awaited time with her mother, but these plans are unfortunately canceled due to work. Opting to go outside instead, she takes a stroll down a familiar path—one where fond memories appear at every corner.
Later, in the middle of autumn, Hinata Kuraue and Aoi Yukimura are looking through a scrapbook of their childhood. Snooping around in Aoi's room, Hinata finds that she has kept a strange acorn as a keepsake, but doesn't remember the reason why. As its discovery dwells on her, a wave of old memories comes forth, causing her to reminisce about a forgotten event from her childhood.
From time spent with loved ones to promises from the past, Yama no Susume: Omoide Present follows the three girls as they cherish old memories while crafting entirely new ones to remember..
(Source: MAL Rewrite)
Bubblegum Crisis
In the near future, Tokyo was left flattened as a result from a great earthquake. A new city, MegaTokyo, was then recreated due in no small part from the aid of a multi-million dollar company, Genom Corp. Genom created and mass-produced biomechanical creatures called Boomers to aid in the restoration of MegaTokyo. When the Boomers began to run out of control, the ADPolice at first tried to stop them, but they proved to be far more difficult to deal with than was first imagined. Under the ever looming Boomer threat, a group of four girls from varying degrees of society banded together. Calling themselves The Knight Sabers, they were the only ones with enough firepower and resourcefulness to defend the fledgling MegaTokyo from Genom and it's berserk Boomers.
(Source: Anime News Network)
School Days: Valentine Days
OVA that came with the PlayStation 2 game "School Days L×H"
Makoto, Sekai, Kotonoha, and many other classmates all go to a hot springs hotel to relax, where they discuss what their plans are for the upcoming Valentine's Day. When the day actually comes, half a dozen girls fight over who gets to give chocolate to Makoto.
(Source: Anime News Network)
Ikkitousen: Western Wolves
The fighters of the Kanto region have been able to determine that the previously unknown attackers are from Nara and are connected to the Yamato School and its dangerous leader Himiko. With leaders Hakufu Sonsaku and Moutoku Sousou already stripped of their Magatama jewels by the attackers, only Gentoku Ryuubi remains as the only fully operational leader. In order to maintain sufficient fighting strength, the fighters of Nanyo, Kyosho and Seito join forces for the counterattack. Although they expect to fall into a skillful trap, in the end they have no choice and even Hakufu wants to join in. However, Hakufu is “forgotten” at one of the stations on the way to Nara…
(Source: Anisearch)
Inari, Konkon, Koi Iroha.: Inari, Konkon, Semishigure.
Unaired OVA bundled with limited edition eighth volume of the manga.
The episode centers around the actions of Inari and Kon.