After an accident our protagonist Amagi Kouichi becomes involved with Itanami-san a well known beauty of his school and secretly a vampire.

From Tokyopop:
Sato Tatsuhiro is a drug-addled "hikikomori" (a Japanese shut-in) who thinks a sinister organization, NHK (Nihon Hikikomori Kyoukai), is the cause of all his problems! He falls in love with a girl, Misaki, who he thinks is trying to assassinate him, but doesn't know how to talk to her or if he can trust her. The more he stays in his house watching anime porn, reading manga, and doing drugs, the harder it is for him to leave. Only Misaki can keep him from rotting away in his own apartment!

It centers around the travels and battles of one Aotsuki Ushio, who is constantly being stalked and aided by a gigantic, supernatural and sometimes invisible tiger (Some people describe it as akin to Calvin and Hobbes on acid).

Ushio's family maintains a Shinto temple in Japan, where 500 years ago, his samurai ancestor battled that same tiger to a standstill, and eventually trapped him against a rock using, a blessed spear called the "Beast Spear", which in addition to its intrinsic formidability as a weapon, can also boost the physical powers of the user. While cleaning out the temple storage, Ushio accidentally unseals the chamber which Tora was trapped in. Initially, Ushio wisely refused to remove the spear pinning Tora (とら, Japanese for tiger) down, as Tora unwisely makes the strategic blunder of mentioning that the first thing he would do upon being freed would be to devour Ushio; but Tora's unsealed presence attracts various demons to the premises, and Ushio is forced to free Tora in exchange for his help. The series focuses on their relationship, interspersed with battles against mythological foes, and with Tora's attempts to grapple with modern life and gobble up Ushio.

Won the Seiun Award for Best Comic of the Year in 1997. It also received the Shogakukan Manga Award for shounen in 1992.

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From Demonic Scanlations:

Due to all of the anger and emotions of humans, the world has been inhabited by ghosts that feed off humans. Unfortunately, these ghosts can’t be seen by ordinary humans. A high schooler has the ability to see these ghosts…

From MangaHelpers:
Hatou Gaku has a very odd friend at school named Marii Yukari. Yukari has purple eyes and a bizarre way of looking at the world: she sees all living things as robots. This has not always worked out well for Yukari, even costing her a best friend when she was younger. However, Yukari insists that the things she says she sees is true, and her vision seems to give her insight into the abilities of others.
Gaku thinks she's just weird, but she soon realizes that Yukari has unexpected talents. It seems she can fix anything, and even the police come to hear her insights. It turns out that Yukari's purple eyes are not unique in the world! However, there is one important distinction among those who see humans as other objects. Do humans appear as unimportant as objects, or do those objects appear as important as human beings?

In the age where the Church is the law and witch hunting is rampant, Bell, a sword toting monk, visits a town called Brokken Brook. There, he meets a nurse in-training named Ashe who helped him treat his wound. But little did he know, just when he started to get to know her better, who she really is. (Source: Casanova Scans)

From Saviour Scanlations & For The Halibut:

A long, long time ago... Wait... it's not really that long ago. There lived a certain Ookami-san (Miss Wolf)... She's bad-mouthed, and not to mention flat-chested. Even so, she's still the heroine. She and her roommate (Akai Ringo, meaning Red Apple, aka Little Red Riding Hood) volunteer at Otogi Ginkou (Fairy-Tale Bank), a high-school club which does favors for others and demands something in return when necessary.

Well then, watch Ookami-san and company in the middle of many kinda weird... really weird stories. Behold, Ookami-san and her Seven Companions.

The sequel to the Baki series, it is supposed to concentrate around the conflict of Baki vs. his father.

From OSTNT:

It’s said that the Great Demon Lord Satan once went to the world of humans to train, however he was eaten by the humans after he passed out in a desert. Feared of the humans, many demons refused to wander the world of humans. In order to become a Super-Mega-Demon Lord, our prince Lucifer finally decides to wander the world of humans to collect 10 billion devil points.

From Yuri Project: The year is 1944, around when Miyafuji Yoshika joined the 501st JFW to protect Gallia. The South European nation Romagna is launching a Neuroi counteroffensive with its 504th JFW, nicknamed The Ardor Witches. Its core is made up by the Duchy of Romagna's elite, the Red Pants Unit, but, what is soon becoming evident as the detachment is coming together, is that the members all seem to a bit peculiar, not the least of which the commander. What will destiny have in store for this group of girls...?

On her death bed, Kousaku Sakamoto's mother tells him that after she dies, he should go to Tokyo where he'll be taken care of by her friend Ibari Oozora and his family. Since his father died three years before and with no where else to go, Kousaku decides to go along with his mother's last request. However, he soon discovers that Ibari is the boss of the Oozora Group mob ring. Uneasy about his predicament, he considers leaving, but he has second thoughts when he meets Ibari's four daughters–Tsugumi, Tsubame, Suzume and Hibari–only to find out that Hibari is actually Ibari's only son. Now Kousaku must not only cope with living among mobsters but also with refusing Hibari's advances toward him.

From the talented artist who brought us Kamisama no Memochou and Masamune-kun no Revenge comes a cute little 4-koma comic about the wacky hijinks of the Nishi High-School Newspaper Club.

From Kodansha Comics:

In the Kingdom of Fiore, wizards are commonplace, but the powerful women of Fairy Tail are each one of a kind! And after fighting their way to the top of the Grand Magic Games, Lucy, Erza, Wendy, and Juvia deserve a vacation. The wizards slip out of the victory celebration to do some sightseeing as a foursome, but where Fairy Tail goes, trouble’s never far behind, and soon they find themselves caught up in yet another chaotic bought of spells lining…with the fate of Fiore in the balance!

New stories starring the magical ladies of Fairy Tail!

Tagamori Shinta is a student who routinely confesses with complete sincerity to any girls that he likes, failing every time with good reason. One day, after another failed attempt, he stumbles upon a strange shrine and ends up making the most important wish of his entire life. A romantic comedy packed with action on a celestial scale.

The main character is a delinquent feared in the whole region. He tried to start a new peaceful life full of love instead of blood but his past immediately catches up to him and reveals his true identity to everyone in the class. He meets a girl in trouble and decides to revert to his old self just to save her.... except she doesn't really need saving, beats him up and calls him weak!. He fell in love with this "flower that blooms in the battlefield" and decided to try to join the karate club (she's the captain) just to get close to her... but things aren't that easy....

When he was young, Kurosu Keisuke was in a special TV program showcasing children with supernatural powers, called "Esper Shounen". Seven years after the termination of the program, a murderer appears to be targeting the Esper kids, whom he/she considers to be monsters. Will Keisuke and his old friends be able to discover the murderer and avoid becoming the next victims?!

Hearing news of demons plaguing the Hakkyokuseiken dojo, Andy leaves his friends to investigate it. To his shock, the rumors are true and the demons' overlord is the formerly deceased Geese. Using his troop of seven demon lords, he imprisons the younger brother and hopes to make him one of minions. Worried about his brother's absence, Terry teams up with Joe, Mai, and Big Bear to battle the undead forces and rescue Andy.

In the 21st century, aliens have arrived on Earth and live among humans. In sleepy Enohana, the dirt-poor student Chigasaki Mayuko finds herself living together with NieA, a low-caste ("Under Seven") alien. While Mayuko struggles diligently to make ends meet, NieA seems to be totally unconcerned with the consequences of her actions.

Note: An omnibus version was released under the name NieA_7 Recycle

From Easy Going Scans:

A watch that controls time, a marble that can find items and a stick of chalk that can kill any human...

The items of the mysterious girl, List of the antiques, all hold their unique magical powers. Without our noticing, they slowly merge into our daily lives.

If you strain your hearing you might discover the mysterious secrets hidden throughout the world. The curtain of this antiques fairy tale finally rises!