A series of short stories detailing the exploits of Dr Imibe Kana, a researcher on Japanese mythology and religion, as she travels around the country becoming involved in various occurrences centred around ancient traditions and folklore.

From Easy Going Scans:

In the near future, Mother Nature has decided to fight back against all human encroachment.

The world has entered your standard apocalyptic scenario that you can find in many forms of fiction, but it's right in the middle of the apocalypse actually happening, rather than in the aftermath. Vines and foliage entangle cities, as large wooden mech-like creatures called Arethusa (named after one of the mythical Greek Hesperides that tended the gardens in a remote corner of the world) rampage through cities.

Souma Shin, a punk kid out of Japan, went to visit his brother Ken, but all hell breaks loose as Shin finds a group of small kids being used for military purposes. He tries to save them in the confusion created by an Arethusa invading the compound...

From: Easy Going Scans

Everyone in his Yakuza gang looked up to him.

He was the boss's favorite pupil, but then in a single night, after he had won so many territorial fights for his gang, he lost everything! Why?

Lin is just an ordinary high school student. But on the day she transfers to a new school, she gets a video game, which sends her to the world of King Arthur. There, she meets a mysterious wizard, who tells her that her mission is to find and gather the Knights of the Round Table and find the Holy Grail.

A manga based on the dungeon crawler RPG videogame Etrian Odyssey 2.

The continent of Yggdra is a place where humans, ogres, giants, forest sprites, and many more mythical creatures live. Led by the Holy King, the continent was at peace until one day, a mysterious group called the Black Army appeared and started conquering the land. In response, the Holy King and its troops fought against it, but Holy Capital fell and the Holy King was killed by the mysterious Black King. As the continent was in the glimpse of destruction, hope glimmered as one man, Yuri, the Hero, decided to fight back and formed the Volunteer Army to oppose the Black King and bring peace back to Yggdra.

From /ak/ Scans :

The hero union's BBS, where heroes gather, crossing many dimensions. A bulletin board made by heroes for heroes. Unfair settings, complaints about comrades, tales of failure, and discussions of secret agendas, they are all found here! Even now, new threads are being made!

A comedic chronicle about the travails of heroes.

SERIES 5: Vento Aureo
Set in 2001 Italy, the story follows Giorno Giovanna, son of DIO, and his dream to rise within the Neapolitan mafia and defeat the boss of Passione, the most powerful and influential gang, in order to become a "Gang-Star" and make the world a better place. With the aid of a capo and his men, as well as his own resolve, Giorno sets out to fulfill his goal of absolving the mafia of its corruption.

Sihoon is a boy who lost his parents and lives with his older sister. This story begins as he meets Mephisto that came to the world to find Faust and makes a deal with Mephisto to supervise the fights between Mephistopheles and Faust.

Pu Reum Han led a normal high school life, that is until, he dreams of a lady, looking for his help to find her missing baby. But what if that baby is inside him?

When a zombie apocalypse hits during the practice of a high school basketball team, it's a whole new life for the coach, Jeff. The world's turned upside down and the girls seem to be handling the changes way better than Jeff, who has troubles adjusting. A close-knit group of friends, the girls are eager to tackle this new world with its challenges!

In this world, every child is born under a god. Some gods are weaker than others. Some gods are stronger than others.

Children born under weaker gods become defunct in society, and cannot attend high school. Instead, they must get jobs after middle school. High school in this world is a place that trains students to use their stronger gods. They have one thing in common: They can grant wishes if the correct price is paid.

Leerang turns back time a day, and pays dearly for it. To reverse his wish, he must attend high school and try to use the powers of his cat god once again.

A long time ago in a galaxy far, far away.
It is a period of civil war. Rebel spaceships, striking from a hidden base, have won their first victory against the evil Galactic Empire. During the battle, Rebel spies managed to steal secret plans to the Empire's ultimate weapon, the DEATH STAR, an armored space station with enough power to destroy an entire planet.
Pursued by the Empire's sinister agents, Princess Leia races home aboard her starship, custodian of the stolen plans that can save her people and restore freedom to the galaxy.

A manga adaptation of the Chinese literary classic "Romance of the Three Kingdoms".

In the world where the taste and texture of food are very important, there is Toriko, a hunter of precious foods regularly hired by restaurants and the rich.
He's a man with the inhuman skills necessary to capture the ferocious, evasive, and rare animals to complete his ultimate dinner course!
His current accomplice is a weak, timid person who was inspired by Toriko's greatness and accompanies him on all his journeys on his quest for the course of his life.

Note: Was nominated for the 2nd Manga Taisho Award in 2009.

From TokyoPop (based on volume 1):

The World at the Brink of Self-Annihilation

The nuclear age has brought with it the arms race, which has led to the advent of weapons powerful enough to destroy the world itself several times over. Unwilling to take the plunge into Armageddon, the world powers, in league with a group known only as the Black Ghost, have developed super soldiers known as the Cyborgs, designed to fight the wars of the world in space. Unfortunately, the Black Ghost didn't ask the Cyborgs how they felt about their role in the new world order.

This classic work from manga legend Shotaro Ishinomori (Masked Rider) not only told a thrilling tale set against a backdrop of Cold War tensions, but it also helped define the genre of super team stories such as Battle of the Planets, Voltron, and The Power Rangers.