Mikage has just arrived at a new school. But why can't he remember anything about his life before the moment he set foot in the school grounds? His classmates, while appearing ordinary enough, all possess strange habits and weird personalities.

Soon after, our bewildered protagonist is summoned by one of his teachers, who claims that Mikage has the power to influence a 'parallel universe' - and that his interactions with his classmates will decide the fates of the inhabitants of that universe. Though initially fascinated, he soon finds out that these 'powers' do not bode well for his new school life...

Set years before the main story, this series follows Minori, Aki, and the other teachers during their days as students at Tenbi.

From vyc:
Takamizawa Shinichi has just transferred schools and is staying at the male dorm with his new friend Kato Masaya who is showing him around. He tells Takamizawa that he needs to pay his respects to Intel who oversees the male dorm housing. It turns out that Intel is a person who looks to be a pretty girl who seems almost machine-like. Although Intel has some human aspects, Takamizawa is puzzled by the truth behind Intel and, whether he wants to or not, he's about to find out more.

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From Tokyopop:
Nightmares are bad enough when asleep, but In Dream World, nightmares are real, physical monsters!
Drake, Hanee, and Kyle fight these Nightmares with not only weapons, but "In Dream Cards". These cards have different elemental powers, and those who wield the cards are masters of their elements. Hanee and her friends must battle their way through the land of Nightmares to find their way home.

Maoyuu Maou Yuusha in 4-koma.

From Yen Press:
A mysterious illness is spreading rapidly through the halls of Fujimi High School. In a matter of hours, the campus is transformed from a place of learning into a hive of nightmares, as the infected students collapse and are reborn as flesh-hungry zombies! Only a handful of students escape the initial outbreak — among them Takashi Komuro and his childhood friend, Rei. He manages to protect Rei from the initial onslaught, but how long can Takashi and the other students hope to survive when the whole school – maybe the whole town — is out for their blood?!

Eri Mizutani, mostly known as ELLIE on Internet, is a hikikomori that spends most of her time chatting on the Internet with people that she hardly knows. One day she receives a message from a producer named Ozaki who encourages her to debut as a real idol. Eventually she is able to build up the courage to meet Ozaki. Then she makes her debut at the 876 productions. She meets Ai and Ryo there and decides to give up her life as a net idol and hikikimori. Will Eri be succesful in the idols world?

One day while playing videogames, a strange creature called Didi approaches Yu Yong Gi and claims he has a chance of becoming a Hero of 0.05%. And as such she has to aid him in becoming one. She starts showing him the evils of being a Hero, and after a while Yu Yong Gi realizes she is actually attempting to deter him from that path rather than aid him. With the cat out of the bag, she confesses she is a minion of the Dark Lord, meant to make sure he never wishes to become a Hero. Does the average Yu Yong Gi actually pose such a threat to the Devil Lords plans?

It follows the life of the conqueror and first great unifier of Japan, Oda Nobunaga, starting from his rambunctious childhood and first experience with a European.

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The story of a normal guy in a ?normal? dorm! http://comic.naver.com/bestChallenge/list.nhn?titleId=349085

"Never piss a girl who treasures a hairclip off." That's what a boy thinks when he got himself into the same trouble.

Top secret agent Im Misun! She's given an absurd mission to become an "ordinary teacher." Her unique lessons start now.

A childhood friend Hoki, an aristocracy girl Cecilia, a transfer student Rin, a “boy” Charles and a slightly creepy girl Laura—a four cell slapstick comedy manga full of laughter and tears! ---- Vera

From MangaHelpers:

One of the most infamous criminals of this country is literally a monster. Vampire Zeo is immortal and invincible. He takes whatever he wants from whomever he wants whether it's from a company or even the government. And when the police or military or even seasoned assassins that specialize in monster killing go after Zeo, they all end up running away with their tails between their legs.

So when a young girl named Lin tells Zeo that she has come to make Zeo atone for his crimes, he laughs it off. However, Lin is from the Church, and, although she is weak, she uses a special spell that combines their souls together, making them essentially one person. Whatever pain she feels, he feels and if she dies, he dies too and vice versa. However immortal he may be, her death would mean his own demise and he has to protect her from those who want Zeo’s head on a platter. Her original mission from the Church was to make him stop his criminal activities, but when Lin learns that the Church wants him dead, she questions her orders and joins forces with Zeo until she learns the truth. [vyc]

From Yen Press:

In the year 2022, gamers rejoice as Sword Art Online - a VRMMORPG (Virtual Reality Massively Multiplayer Online Role Playing Game) like no other - opens its virtual doors, allowing players to take full advantage of the ultimate in gaming technology: NerveGear, a system that allows users to completely immerse themselves in the game world by manipulating their brain waves to create a wholly realistic gaming experience. But when the game goes live, the elation of the players quickly turns to horror as they discover that, for all its amazing features, SAO is missing one of the most basic functions of any MMORPG - a log-out button. Now trapped in the virtual world of Aincrad, their bodies held captive by NerveGear in the real world, users are issued a chilling ultimatum: conquer all one hundred floors of Aincrad to regain your freedom. But in the warped world of SAO, “game over” means certain death - both virtual and real…

Majima Rei is a practitioner of a martial art born from the battles in the Sengoku era, the Jinnai style jujutsu. During middle school he was a delinquent but, when he became a highschool student, he swears that in order to surpass the one said to be the strongest practitioner of the Jinnai style in history, the 8th head Jounouchi Masashi, he will become the strongest martial artist in the world. For that purpose, he battles against various types of martial arts and fighters.

Souki Hiiragi was a normal small town boy whose only desire was to make cute girls happy. But one day at the beach he gets caught up in a giant robot fight! One robot attempts to defend him; this robot is the Jinki--which requires two operators to run properly. One operator sacrifices himself to save Souki, but now the other operator needs a partner! She being a cute girl, Souki steps up to the plate!