Liang You Xin is a kind and innocent girl who has left home to further her studies in the Tyrol in Europe. During her travels, the seemingly innocent act of helping a stray pig sends her to a different dimension in the Royal Palace Museum. There, she meets a mysterious young man clothed in black who invites her to the Royal Palace as a guest. Expecting to find an abandoned palace, Liang You Xin is surprised to find Tyrol’s 17th Century Royal Highness instead. This fateful encounter changes her life from one of scholarship into slavery… - from Allinav

In the future (1998), Japan has fallen under military control. As young men are conscripted to help with the war efforts for longer and longer periods, Risa waits anxiously for her boyfriend's return...

In a future where cyborgs are more common than fully flesh and blood humans, a girl goes out to seek oil when her family's ration gets cut off. She needs to get it quickly so her grandmother's heart doesn't burn out, but no one has ever gone up above to the ration center and returned alive.

After a fairly futile attempt at capturing the heart of Jinnai, Kijima finds himself dealt with a lucky hand once again.

One day, dazzled by the pattern of a beautiful kimono, he suddenly finds himself enchanted by the talent behind its simple genius. Just how far will he go for such a lovely masterpiece?

The day of the coronation has finally arrived, but peace is nowhere in sight. The King is still under attack by a mysterious faction that is trying desperately to put an end to his life.

And this time around, the trials facing them might just be too great to overcome. His Majesty and his "Right Eye" both have secrets they're keeping from each other. Secrets that could tear them apart... And destroy the kingdom.

The events chronicled in this manga are also depicted in its own campaign in the Gundam: Meguriai Sora game for Playstation 2 (released in the US as Gundam: Encounters in Space), as well as a novel by Kazuki Miyamoto.

Some of the characters are seen briefly in Mobile Suit Gundam - Lost War Chronicles manga.

Note: A masterpiece collection titled Kidou Senshi Gundam Gaiden - (Uchuu) Sora, Senku no Hate ni... was release in 2015.

A cat falls in love with a human who once took care of him. Wanting to stay by the young man's side, he agrees to a deal that would allow him to take human form--except in the eyes of the one he has feelings for! What will become of this love?

A collection of stories:

1) Ano Hi, Seifuku de (That Day, in the Uniform)
I haven't got myself used to this adult-like appearance with some nostalgic flavour of youth.

2) A Senpai
Body and mind think different things. But which one is true? A junior and senior love triangle.

3) Chuugaku 3-nensei (Middle School, Third Year)
There is a pervert in the male restroom in the book-store. Beware!

4) Hadaka no Boku (Naked Me)
Being shaved, becoming naked, the hidden feelings

5) Tenkousei (Transfer Student)
The secrets under the uniform, that none of the classmates knows.

6) Nikoichi
God knows when my childhood friend become much tinier than me. We have been through the heights and lows together, and now is my start with that childhood friend.

6.5) Extra to Ano Hi, Seifuku de - Konya, Ano Hi ni
2 years have already passed since that night.

From Omari's Sister:
Yukari, at the tender age of 17, is a renown Edo period novelist who claims visions of Yoshihara during the Edo period gush from his heart. After meeting Mahoro, a girl he swears he knows and has met before, Yukari finds himself falling asleep and waking up in the Edo period as an Oiran. The past and present collide in this time traveling romance.

Yukinari was abandoned as an infant, but fortunately a loving family adopted him. Perhaps because of this, he has an affinity for helpless, abandoned creatures and goes out of his way to help them. One night, Yukinari and his friends witness a falling star hit the ground and rush to the spot where it hit, only to find a child cradled in the meteorite, surrounded by a field of roses?!

A collection of stories:

1) Ano Hi, Seifuku de (That Day, in the Uniform)
I haven't got myself used to this adult-like appearance with some nostalgic flavour of youth.

2) A Senpai
Body and mind think different things. But which one is true? A junior and senior love triangle.

3) Chuugaku 3-nensei (Middle School, Third Year)
There is a pervert in the male restroom in the book-store. Beware!

4) Hadaka no Boku (Naked Me)
Being shaved, becoming naked, the hidden feelings

5) Tenkousei (Transfer Student)
The secrets under the uniform, that none of the classmates knows.

6) Nikoichi
God knows when my childhood friend become much tinier than me. We have been through the heights and lows together, and now is my start with that childhood friend.

6.5) Extra to Ano Hi, Seifuku de - Konya, Ano Hi ni
2 years have already passed since that night.

A collection of short stories:

1 - Pineapple Girl

2 - Kamakurian
Sci-Fi story about building kamakuras after the weather warms further globally providing less snow for local customs.

3 - A Happy Birthday from Paradise
Hoshihiro is a 40-year-old virgin who desperately wants a girlfriend. But thanks to his "chastity", he has been chosen as the next fairy king. But in the two weeks until the wedding...

4 - Tsutsu-Izutsu
Itagua and Kagua are two aliens whose spaceship broke down while they were visiting Earth, leaving them stranded and hiding in a dried water well. Due to the distance to their planet, they took 13 years to ask for help. And now finally...

5 - Cops and Robbers
A petty robber learns of the existence of the "Village of Honesty", where they only tell the truth, and he goes with the purpose of rip off all the townfolk. At the entrance of the village he finds a fork with two beautiful women, one who tells the truth and one who tells lies, and he could make only one question to find the right way.

6 - New Century Godslayer
God decides to destroy the world because of mankind's behavior and entrust the creation of a new world to his son.

From Summer Rain:
Between three highschool students, a secret love affair begins..

The Premise is a story about the moral contradictions and ethical dilemmas that arise when two policemen discover a criminal gang, commonly known as “The Executioners Sect”, which wants to enforce justice through a horrible method.

The first story, Wings of Light and Darkness, takes place between episodes 43 and 44 of the GaoGaiGar TV anime. In this three-chapter story, a bit of the backstory of Soldato J and Arma is revealed as they come into contact - and conflict! - with one of J's old comrades: the Black Soldato, J-013.
he second story, Evoluder Guy, takes place between the end of the GaoGaiGar TV series and the start of the GaoGaiGar FINAL OAV series. In its five chapters, witness the theft of the new Super Mechanoid - the Fighting King of Braves, GaoFighGar - by the underground global criminal organization, BioNet.

From Yen Press:
Sora, a young boy who lives a peaceful life on his tropical island home, is set adrift when a horrible storm wrecks the world he loves and separates him from his friends, Riku and Kairi. In another world, the Disney castle is in chaos when King Mickey goes missing, and it’s up to Donald, the court magician, and Goofy, the captain of the army, to find their king. When both Sora and the King’s allies happen upon each other and learn that the ills that have befallen their worlds are the doing of dark beings without hearts known as the Heartless, the three recent acquaintances take up arms together in an epic quest to travel to unknown worlds, set those worlds right, and find their friends!!

Mira attends a private school in England and finds out that the boy who appears in her dream since her childhood really exists. He's Radley Macchiavelli, a beautiful model. When the two finally meet, the boy is transported to a parallel world connected from one spiral ("Rasen"). Mira follows him to try to save him and is swallowed into the parallel world dominated by the mysterious Black King...

From NOIR:

This is the story of two siblings, Joo-won and Hee-won, and one man determined to take Hee-won's heart. Both Joo-won and Hee-won feel isolated after their parents separate due to infidelity and remarriage, placing both of them in new families. However, Hee-won's new step-brother, In-hyuk, notices Hee-won's suffering. Is he determined to take care of her, or is there something more?

An alien species wanted to start a revolution against their oppressors, and they think they may have found the power in humanity to accomplish their goals. They discovered that humans have latent superpowers, and so they began to abduct them and awaken their abilities. Unfortunately, the humans' abilities were not very useful for their purposes---at least not until they found the destructive power of #214.
#214 is actually a young woman named Hoshi Yumako, who has no interest at all in the aliens' revolution. The abduction and powers have seriously screwed up her life, and all she wants is to be able to live a normal life. Pursued by the aliens, she tries to work part-time and keep her powers from ruining everything. However, she knows she's not the only one out there; she might find allies among the empowered rejects of the aliens' experiments.

Prequel to the Gundam Build Fighters TV anime, covering how Yuuki Tatsuya got into Gunpla Battle.