Universal Century 0153. During the war between the League Militaire and the Zanscare Empire, Uso Ewin while alone on a reconnaissance mission happens upon the Zanscare Empire's Newtype squad, and finds himself blind-slighted by a Zoloat, and comes under attack by the mysterious Mobile Armor Zong. However he finds himself rescued by an old junk dealer Grey Stoke. The pilot of the Zolat, who was also rescued alongside Uso is revealed to be a young girl named Kamui Gian.

Yuki Tachibana, a withdrawn third grader, is convinced that the fourth floor of his school is home to supernatural creatures that few kids (and no adults) can see and he's worried about a recent influx of new, less friendly creatures and about his ability to perceive the true shape of things waning as he gets older. Most of the other kids mock Yuki - they think he's crazy due to his strange pronouncements and peculiar actions - and, aside from the creatures he sees, his only social interactions are with the school's kindly and open-minded caretaker, a new transfer student named Makoto Suzuki who's allocated the desk next to his and an enigmatic boy named IQ who always wears a box over his head.

February 23rd, 20XX.
Looking for a job in the famous TV station at Odaiba, college senior Jin Mishima attended the recruitment orientation. Not far away from the station, Nanako Okano, a gothic lolita trying to attend a concert, found out that her friends tricked her about the concert ticket because of jealousy. The two bumped into each other and "reunited" -- they were junior high classmates -- moments before an earthquake of Richter Scale 8.1 turned the island (the entire city, in fact) into ruins.

From Tokyopop: Yen and Jin are brothers in elementary school and successors in the Ragun family craft of defeating evil spirits. In this world, the battle with spirits comes down to a game of guessing your opponent's "name." Once you know the name you gain control over the fight. Both Yen and Jin have secret names only they know ... and must keep them secret or risk death!

Kaoru’s baseball team is in need of a miracle. They’re facing a rematch with a tough group of sixth graders, and if they don’t win this time, then they’ll forfeit their right to the practice field. Luckily, teammate Yohko’s crystal ball shows them that their savoir lives in the mountains that surround their town. When Kaoru makes the journey to the mountains, he discovers a young ninja named Kyuma, who lives alone and trains with his ninja dog, Inui. With Kyuma’s skills, the team might have a chance to win, but only if Kaoru can teach Kyuma the basics of baseball, and fast!

Beautiful, delicate Yoon Sul and tall, brawny Taehee are exact opposites, and yet somehow they can't escape each other! And now with the addition of the popular student representative, Sijun, being interested in Taehee, how will Yoon Sul react?! Action-packed romantic comedy with a twist!

It's mainly about two different armies battling each other out with their mecha.

From Easy Going Scans:

The Prince of Qin sets sail for his 100th conquest; If he comes back victorious, the throne will be his and he will be able to marry his childhood sweetheart! Will he come back victorious? Or does fate have other plans for him?

From ilovemanhwa.com:

A HIDDEN WAR AROUND THE SECRET OF SEOUL, THE 600 YEAR OLD CAPITAL OF KOREA. Joo-hee never dreamed he would be investigated in the Presidential Residency by making emergency calls to see the flame from the city center though he felt wrong to know noone else witnessed the flame at school. People from National Fengshui Office said Seoul is in danger, for some people are breaking the seals on the places of bad chi. Indeed, people are killed by unearthly monsters, and not knowing what talent he has, Joo-hee's life is swept to this hidden war.

Demons, they are born from stagnation, fear, hatred, and sorrow. Attracted by negative emotions of humans. In this world there are people who were able to fight against them, they possess the skill of a secret art. Transforming their soul into a blade, they are called Onmyouji.

From Tokyopop:
In the year 2068, the Brain Computer, created by humans to be the core of a machine-driven Earth, itself creates Leave, an android that far surpasses the abilities of humans. With mankind now an unnecessary aspect of the Earth ecosystem, Leave, along with her 'father' Fenrir (the human scientist who raised her), destroys humanity and in its stead creates the four 'Mothers' who in turn create an android race modeled on Leave known as the Selenoid.
They divide the world into four parts, each ruled by a Mother, and then further sub-divide the android population into hierarchical levels with the strong at the top and the weak at the bottom. A virtually perfect society ...
And it would have remained perfect if some of the surviving humans hadn't formed a revolutionary group together with some of the lower caste Selenoid with the explicit purpose of overthrowing Leave and delivering the Earth back into the hands of the humans.

Manga adaptation of BlazBlue game.

They arrive in silence and darkness. They descend from the skies. They have a hunger for human flesh. They are everywhere. They are parasites, alien creatures who must invade - and take control of - a human host to survive. And once they have infected their victims, they can assume any deadly form they choose: monsters with giant teeth, winged demons, creatures with blades for hands. But most have chosen to conceal their lethal purpose behind ordinary human faces. So no one knows their secret - except an ordinary high school student. Shinichi is battling for control of his own body against an alien parasite, but can he find a way to warn humanity of the horrors to come?

Won the 1993 Kodansha Manga Award for General Manga and the Seiun Award for Best Comic of the Year in 1996.

Escaflowne, the God Protector of Fanelia, has been stolen and the country is left in ruins. Desperate to find the key to Escaflowne's seal and recover the legendary guymelef, Van Fanel, Prince of Fanelia is sent to Earth, only to find it in the possession of a high school girl, Hitomi Hoshino. With enemies chasing them at every turn, can the two reclaim what was lost? Named Messiah Knight when serializing in Monthly Asuka Fantasy DX, but renamed to HITOMI when tankoubon were published.

From Dan of Population GO:

"Mutants have popped up in Tokyo. These mutants are the relatives of gods and upon consuming human blood they transform into their awakened state which resembles the god that they are related to. Hachi has a nose as good as any dog's. After his best friend is attacked by a mutant he drinks her blood in order to save her."

Oneshot about pilots killing creatures from sea

An alternate universe story starring the yuri couple of "Kannazuki no Miko" and "Kyoushiro no Towa no Sora" fame, Chikane and Himeko.

In this series Himeko is a nun who leds a peaceful but lonely life, having lost both her parents and her beloved older sister.

One day she finds a girl hung inside the church, impaled by a sword. The girl, who strongly resembles Himeko's dead sister, is still alive and calls Himeko's name. She reveals that her name is Chikane, but she has a memory loss about everything else.

From that moment, Himeko starts to be targeted by a group of people who want to obtain the "Dragon Cry", which is said to be hidden inside her body. Chikane (after trying to know Himeko "more intimately") vows to protect her.

Hundreds of years ago there was a battle of two beings on earth, one who calls themselves the 'Celestials' and another one which is known as the 'Darkseeds'. The Celestials won the battle but hundreds of years later the 'Darkseeds' who calls themselves the Puaka has started to rise again. It will be time before another battle begins. The Celestial king sent his warriors in search of the Puaka King to destroy the Puaka king before he could gather his army and rise against the Celestial King again. The story focuses on two of the warriors, the twin brother and sister Purnama and Suria in their journey to avoid another battle from starting. Inspired from the folklore of Southeast Asia.

Han Sae Lee is every girl’s dream—tall, dark, and handsome with a whole lot of attitude. He knows he’s the catch, but right now, he’s interested in catching a brazen, blond brat and teaching him a lesson or two... WAIT! How can one skinny (but very cute!) boy with sticky fingers (stole Han Sae’s wallet when they first met) give him the run-around so easily? There’s something about Moto that makes Han Sae see red—and not necessarily with anger.

Somehow, Moto has entered Han Sae’s life and shows no signs of leaving. What are Moto’s motives for befriending the “prince”? How far can this friendship go? These questions plague Han Sae as Moto becomes more important to him than he wants to admit. Looks like every girl’s dream man has some growing pains to go through…

On the floating island of Lithos, war is ever-raging and there seems to be no end in sight as the three nations that live atop it vie for control. However, as the battles rage on, it is discovered that the crystal that makes the island's floating possible is diminishing in power and the risk of the island falling becoming ever closer to reality. Seeking to find another place to live, the three kingdoms appoint their own elite soldier, a "Dragon Rider" , to fly to the ground below in search for the utopia known as "Arcadia" where there is no such thing as war.