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.

Kagura is the last remaining survivor of a vampire attack at a laboratory, and is saved by Nicol, a member of a troop of soldiers employed by the Vatican. But both Kagura and Nicol are hiding secrets, neither one is exactly who they claim to be.

BlazBlue - Phase 0 ~Prologue~ is a single volume gift that came in the Japanese version of BlazBlue Continuum Shift II for Nintendo 3DS. This manga summarizes the first act of the novel BlazBlue Phase 0, telling the story of the first meeting between Ragna and Celica and later with Mitsuyoshi. Perfect companion material for the novel.> Part of the BlazBlue series( http://www.batoto.net/search?name=BlazBlue&name_cond=c&artist_name=Arc%20System%20Works&artist_name_cond=c&genres=;e9&genre_cond=and )

Spirits that eat people's words - UnLeong. In return, they make people's wishes come true. Oh Sung is an UnLeongist who counsel others who have wishes that cannot come true unless UnLeong help them.

World War Two. Deep in the German Reich, Vincent leads a fairly normal life despite not having any extensive memories, alongside the owner of a weapon shop and his friend, Michael, that seems to know more than he lets on. The firebombing of Dresden, as the result of the Allied campaign to force the capitulation of Nazi Germany, ravages the city, leaving only destruction alongside an extensive number of charred buildings and corpses in its wake. Vincent seeks to know the truth about himself and meet his friend Michael once again, but that might be a journey too dangerous for him to undertake.

From Ochibichan:

Aritsune is the head of the clan which wields the power of “Kaiyori”. As long as one can obtain the “Aya” which the clan head holds, no matter who, he will gain magnificent powers...
He lives a normal school life with his trusted aide, Chika and his beloved sister, Akira. But, without noticing, and also due to the powers he wields, everything started changing...

Note - This series was cancelled due to copyright infringement.

The Tenshou Azuchi period is the period of the secret awakening of "Jiki", the demons sealed by gods. The Jiki eat on everything in the human world, but no human can notice the Jiki's presence. The only ones to stop them are these adventurous young mikos and Bateren people.

Note: A one-shot prototype titled Emeraldas was published in 1975 in Akita Shoten's Monthly Princess.

From Yen Press:
When thirty thousand Japanese gamers are suddenly trapped in the online game world of “Elder Tale,” a realm of swords and sorcery–that was, up until yesterday, very much a fantasy–is now their cold, hard reality. Severed from their everyday lives, they’re faced with fighting monsters, eating food with no flavor, and being unable to die?! Amid the chaos in “Elder Tale” Akihabara, veteran gamer Shiroe locates his old friend Naotsugu and teams up with the beautiful female assassin Akatsuki. Together they embark on an adventure to change the world as they know it!

In an alternate Earth, the armies of the Imperial Alliance have ravaged the entire Europan continent in 1935 EC during the Second Europan War. In the middle of the war, the army invades Gallian territory to acquire a mineral known as ragnite. Standing in their way is a recently drafted militia officer named Welkin Gunther, son of known Europan War hero, Belgen Gunther.