A five minute parody special released with the first episode of the Stratos 4 OVA.

On or around the release of the first game in the series on the Famicom, a 3-minute promotional anime was created to advertise the game. More than a commercial, less than a special, the piece tells a highly abbreviated version of the game's story (spoiling its biggest twist!).

Promotion music video created to pitch a full OVA, to no avail.
 
Music sung by Megumi Hayashibara and based on the Nihon Falcom video game.

Kido Tatsuhiko moved to Tokyo to attend an art school and start his new life. In his new room, there's a small hole in the wall. At first he can see nothing through the small hole, but one night, through the peeping hole, he saw a girl named Ikuno Emiru, a perverted voyeur who ropes him into her peeping fetish... But each winds up getting more than they bargained for. 
Bundled with the limited edition of the manga's 13th and final volume. 
(Source: AniDB)

With the help from a mysterious creature, Elena turned herself into a magical girl to beat Zoid, a tentacle monster to save her sister, Emile. 
Since that day, to protect her sister and to keep peace on the earth, Elena started to fight against the ugly creatures as a magical girl! 
However, what awaited her is a harsh destiny: immoral days of naughty humiliations. And her battle eventually involves her sister and her dead mother. 
Can Elena exterminate the tentacle monster, or is she driven crazy and lost her reason by the ecstasy? 
(Source: DLsite)

Tadashi is a high school student and computer-game addict. After a long day spent playing the game Zenon, he is visited in a dream by the heroine, Sartova. In an anime replay of The Last Starfighter, she takes him to the world of Zenon, where the game is played with human lives at stake. 
The show starts with our hero Hiroshi easily defeating an arcade machine, impressing all of his nerdy friends. When he gets home, he finds a bizarre new game waiting for him on his computer. The game promises him a chance at winning the heart of a beautiful girl, so Hiroshi presses "Yes" to begin...only to have the screen turn to static right in front of him. 
Skip to the next day. Hiroshi starts telling his friends about this game, and they aren't sure what to believe. But right then, in the middle of the class, a huge electrical storm hits, leaving in its wake a lone white egg. When Hiroshi touches it, the egg opens, revealing a beautiful (and stark naked) green-haired girl. 
This girl, Hiroko, gives Hiroshi the name Zenon and gives him all sorts of powers, including ESP. That's all well and good, but right afterwards all the way to the very end, Hiroshi/Zenon winds up battling all sorts of evil bad guys and huge meanies non-stop to protect his new sweetheart. 
(Source: Animerate)

Kimi ga Nozomu Eien parodying the Gundam series in two minutes.

Short specials added to DVDs and Blu-rays.

Aika's story continues, she is now 19 years-old, 3 years older than in R-16 and 7 younger than in Agent AIKa. Strange phenomena have been occuring at a girls academy. Slowly but persistently the most cute and beautiful girls are joining an internal club, but instead of a sing-in they just get abducted by a strange being that takes control over them by some indecent means. 
By coincidence Aika was flying-by on her plane when one of this abductions occurred and she was attacked to prevent her from comming closer, but instead of repelling her, she is intrigued about the attack's origin and then the opportunity shows up when her late partners from R-16 decide to investigate those abductions. The story remains full of action and panty flashing that are a must in Aika's series.
 
(Source: Anime News Network)

Forgiven of her crime of looking into the past life of the one she loved, Yama Rikudou is a powerful being from the underworld sent to the human realm to hunt demons. She must eliminate the overflowing evil here in order to provide some balance to this world.
 
(Source: Anime News Network)

A bonus ep about Aika and company moving to a new office.

Rags Town is the garbage dump of Japan. The place where people who want to forget their pasts run to. In this town, where the rules strictly forbid asking about the past or getting to know people, there is small detective agency called S&amp;A Detectives. 
The story revolves around Ayamana, the inseparable pair of misfit wannabe detectives, the case Manami takes on impulse, and the trouble that arises from it. On the case they find a woman who is abnormally hot, and who is being chased by a bunch of women with guns. After being dubbed Sara, the detectives try and figure out just what is going on with her. At the same time, all over town teenage girls are burning up and turning into glass. The government is covering everything up, but the detectives, as well as a nosy reporter and the local police, are determined to find out what is happening.

Loosely based on L.F. Baum's novel, The Wizard of Oz. Original manga done by Itsuki Natsumi. 
A nuclear war has killed most of humanity and split the USA into six warring states. By 2021, a legend has grown up about the fabled city of OZ where everything still works. Scientist Felicia sets out in search of it with the mercenary Muto and android 1019. At the end of the quest they only discover a military base and a madman. 
A mercenary was hired by a girl to bring her to the mythical Oz (a paradise) where her missing brother supposedly lived. Accompanying them was a cyborg sent by her brother. But Oz was not the paradise it seemed and her brother was not as sane as he was smart. 
(Source: AniDB)

Prince Mars, heir to the throne of Aritia, has fled his homeland and the invaders bent on conquering the entire continent. Together with the Aritian Knights he hides and bides his time in the friendly island kingdom of Talus. Though criticized for constantly daydreaming or being in a bad mood, he has found a friend in Sheida, the princess of Talus. Together they indulge in hayrides and shopping trips, or just standing upon the parapet and looking out over the land. However, despite how pleasant life is, he cannot forget the circumstances that separated him from his land and forced his beloved sister to sacrifice herself for him.
 
(Source: Anime News Network)

Based on the erotic game by Mink & M no Violet. 
 
As Yusuke Nakonishi begins his new job at the Best Beauty Body Lingerie Company, little does he know that he's about to find himself in the center of a ring of business and sexual intrigue. Charged to disrupt and eliminate the cohorts of an opposing faction, Nakonishi thrusts himself on the prowl after three of his sexy co-workers around whom this sex drama spirals. 
 
(Source: AniDB)

A mysterious giant robot easily defeated many powerful robots from many countries. The whole world is wondering what country made him. Aside from those battles, 3 princesses are living in a far little kingdom, and one of them has constructed her precious friend.
 
(Source: Anime News Network, edited)

Aika is a smart and athletic high school girl. She is so competent that she successfully passes the salvagers license test, obtaining a C-class license. Yet, she is young and hotheaded, so much so that Gota still treats her as a child. Due to this personality, no one is willing to hire her for salvaging jobs. 
Since she had taken the trouble to get her license, she decides to post an ad in her school to attract clients. She manages to get the attention of Erika, a daughter of a rich family and the leader of the treasure hunting club. She asks Aika to salvage something from the sea and Aika delightfully accepts the request. 
However, upon seeing the state-of-the-art submarine loaded onto Erika's private cruiser and discovering their destination, Aika realizes the terrible nature of her assignment. This results in a clash with a group of high school girls in the southern islands. 
Who is the mysterious girl named Karen? So begins Aika's newest challenge! 
(Source: AnimeNfo)

Transfer student Takisawa Noboru quickly learns that all disputes at his new school are settled in the boxing ring. Now he finds himself in a series of showdowns with the local top dog, Ibuki Saburo, for the love and respect of the beautiful Yukari.
 
(Source: Anime News Network)

VIllgust is a peaceful world that exists parallel to ours. However, now an evil deity has been revived and has sent evil creatures to destroy many countries, which left darkness and terror to rule the world. The peoples' prayers and cries has reached out to the goddess Windina and in order to free the world from darkness she chose eight brave warriors to defeat the evil deity. Although blessed, these warriors are unaware at the path chosen for them, thus the two groups of Kui, Chris, Fanna, and Youta must meet up with Murobo, Remi, Ryuquir, and Bostov before they can follow the path chosen for them and defeat the evil deity.
 
(Source: Anime News Network)

In the distant future, mankind is divided into two factions: Union and Deague. They have waged a war against each other for so long that no one remembers when it first began. The backbone of the Union military is the manned weapons system Strain, while the Deague uses an unmanned version, the Tumoru. 
Sara Werec, the daughter of a respectable family, is a 16-yearold girl who attends Grapera Space Armed Soldier Academy located in the Cranial Solar System, where she is training to become a full-fledged Reasoner (a Strain pilot). 
Her brother, Ralph Werec, had been sent to the frontline 130 light-years away to accomplish a special mission when she was 11 years old, a distance that requires 400 years of objective time to traverse by even the fastest Union spacecraft. However, in accordance with the theory of relativity, this corresponds to only two subjective years (time as experienced by those within the spacecraft). 
The two of them had lost their parents when they were young and the bond between the two is very close. It is Sara&rsquo;s dearest wish to be reunited with her brother. To do that, she must travel to the battlefield where he is. 
One day, Sara&rsquo;s planet is suddenly assaulted by Deague forces. To her surprise, her brother, Ralph, turns out to be one of the raiders who successfully kidnap a mysterious girl sleeping in a capsule. 
In order to find the truth, Sara gets in a Strain and chases after him. However, she is attacked by Ralph, and the Mimic, a copy of the pilot&rsquo;s brain which is essential to controlling the Strain, is damaged. 
(Source: AnimeNfo)

Born of legendary origins, the young Madara has grown up in obscurity as an apprentice blacksmith. An encounter with the demonic Mouki reveals his destiny, and catapults him into the middle of a mystic quest. Madara fights for revenge with the help of freedom fighters, magical swords and Kirin, the master of the Majin. His goal is to defeat his brother and then overthrow his father, the despotic Miroku. 
(Source: AniDB)

Rei goes to an anime convention and ends up in a world created by the desires of anime fans. Rei doesn't know how to get back and the world starts to collapse because the convention is coming to a close. 
(Source: AniDB)

In Iraq, a group of archaeologists discover ancient relics that prophecize the coming of a superior race and the end of all civilization. Meanwhile, back in Graviton City, as A-Ko and B-Ko's rivalry over Kei intensifies, Mr. Daitokuji sets up an arranged marriage between Miss Ayumi and Kei. Furious over the engagement, both A-Ko and B-Ko do whatever it takes to prevent the wedding from going through. Little do they know that another alien fleet is on its way towards Earth.
 
(Source: Anime News Network)

In the middle of another break from school, A-Ko dreams of finding the perfect boyfriend. Because of this, she and C-Ko get into an argument that leads to C-Ko running away and nearly getting hit by a motorcyclist named Kei. While working part-time at a fast-food restaurant to raise money for a party dress, A-Ko meets Kei and immediately falls in love with him. B-Ko happens to like him as well; however, both A-Ko and B-Ko are unaware that C-Ko is the apple of Kei's eyes.
 
(Source: Anime News Network)

A-ko and B-ko are bounty hunters in an untamed world. When a young heiress, C-ko, falls out of the sky and into their hair, they find themselves battling space pirates and galactic police. Turns out the high-pitched, hungry C-ko holds a secret &mdash;the spirit of an ancient evil&mdash; and is the center of a plot to destroy the universe!

Studio Fantasia