One of the first Super Robot manga and the one that introduced most of the traits of the Mecha genre. Constructed with the Super-Alloy Z, Mazinger was built by Professor Juzo Kabuto as a weapon against the Mechanical Beasts of the evil Dr. Hell. Koji Kabuto, the grandson of Professor Kabuto, becomes the pilot of Mazinger Z when his grandfather is killed, and battles from there on against Dr. Hell and his allies. This is the first series that introduced the concept of a pilot inside a Mecha, which all series from then on have followed.

Humans are always evolving. The ones who evolved in the right path would embody superpower, and called the "White." However, the when their psyche can't keep up with the evolution of their body, they'll lose their mind and go berserk. They are called the "Black." Jin is a part of Black Line; the security company against the Black. Jin swears to eliminate all the "Black" from this world–– wether by finding a cure to end the spread of the "Black," or with his own fist and power. (Source: MangaHelpers)

Those in serious debt to a certain man can either pay the price or join a certain game, a "gamble" as he likes to put it. To win, you must acquire points by defeating the other game participants. What will happen to the players...?

When the Fullmetal Knights Chevalion defeated the Death Universe, peace returned and the Chevalion members returned to their normal daily lives. Well, except for their leader, Retto. For some reason his suit won't come off. So he's stuck as Chevalion Red, and he has problems controlling his powers.

Top student Wang Fei has always dreamt about becoming a Judge, a pillar of light and justice for the people! However fate isn't on his side and he ends up going to a high school for delinquents. How is he going to survive? Will he rise to the top or be gobbled up in the chaos of the hell that is Shiji High School?

From Seven Seas:
Seven years have passed since Mina Țepeș' triumphant return to the Bund. The year is now 2020; integration of vampires into human society has greatly progressed, the threat from the three clans has been eliminated, her rule over vampiric society appears absolute, and the Bund has became an integral part of the world economy.
Now Tokyo is hosting the Summer Olympics with Mina as guest of honor at the opening ceremonies. During her speech, terrorists infiltrate the stadium and demand that she close the Bund and remove all vampires from Japan. In front of TV cameras, Mina and Akira must confront the terrorists. And that's not the only threat waiting for them.

Kanzaki Rei is an avid gamer, but one day he hit rock-bottom due to his debts. During the night while sleeping, a strange phenomenon happened and sent him inside the game he previously played. A world of life and death awaits.

From Sura's Place:

The 12 animals of Zodiac are given powers to rule the time. However, the dog commits suicide, thus removing himself from his role. The rat and the cow attempt to find the 13th animal, the cat, to replace the dog.

However...

Aoi Hana is a normal female high-school student, though she is extremely clumsy and thus tagged as good-for-nothing. But Hana wants to change herself and decides that finding a part time job would be taking the first step in that direction. Being an animal lover, Hana's job of dreams is encountering animals day-to-day and taking care of them - the zoo sounds like the perfect place for that. So when she happens to see a job offer from a local animal park it's settled she'll attend a job interview.
When Hana arrives at the zoo everything seems just fine. The "Oumagadoki Zoo" might be going south but altogether it's your regular animal park. Just a very normal zoo, one might think. But that is only until Hana gets to meet the zoo director...

An anthology comic of Infinite Stratos by various mangaka.

Haru Okamoto, a teenage girl who adores katana, is just now entering high school. When she was little, she happened upon a katana in her grandparents' house. In their haste to get the blade from her, they agreed that when she was an adult, the katana would be hers. However, to her dismay, they do not agree that a 15-year-old, immature, excitable Haru is an adult! Luckily, she finds another outlet for her love of Japanese swords, the almost-defunct high school Iaido club! As Haru searches for new club members and tries to get over her fear of boys, she will become aware that her affinity for Japanese swords has a deeper source than she could have imagined!

Yuzuko was left alone after her grandmother passed away. Shadowed by a mysterious organization, her family murdered by a psychopath, and with the sudden "breakdown" of the world, the missing pieces to everything is revealed, and the "Peppermint" inside Yuzuko activates...

From MangaHelpers:
Siblings Ayane and Kurumi have unique supernatural powers known as Ghosts, each with their own unique rating that designates their powers. Ayane has a score of 7, while Kurumi has a score of 11. Ayane's ability allows her to control shoe laces, while Kurumi can form contracts with objects, which allow her to control them. Ayane feels severely inferior to her sister, but will she be able to prove herself against the other Ghost-bearers in combat?

From Yen Press:
Wending his way home after a bender one evening, master moocher and game programmer Keita Ibuki decides to satisfy a craving for ramen at a noodle stand. Instead of slurping soup, though, he surrenders his meal to a manic girl who, unbeknownst to Keita, is a Mototsumitama, a guardian of the coexistence equilibrium. When his new acquaintance is attacked, Keita gets caught in the crossfire and loses an arm. Awakening from the shock of his injury, Keita finds himself back in his apartment... arm intact! But just whose arm is it?! Asking the strange girl raiding his refrigerator reveals only that Keita's life has become a great deal more complicated.

- The synopsis is not the same as, the B.A.W version, I used the B.A.W synopsis because it was just easier than my TLer to translate it. - So please stop changing this description as they are actually not the same...

China 2A.D.: the corrupting Han Dynasty has thrown the entire country into chaos. Peasants revolt against the government. Into such an age, the ruthless and infamous hero, Cao Cao Mengde is born. Destroying old customs and values, he tries to unite China, with a band of promising and intellectual followers, handpicked for their individual talents and potential. Generally thought a villain, Cao Cao Mengde is portrayed as a hero in this story, which focuses on what kind of person he actually was. There are two other protagonists: Liu Bei Xuande and Sun Quan Zhongmou. Liu is a man of high morals and infinite potential. His servant, Zhuge Kongming is a mysterious man, who helps Liu to become a king who is loved by millions. Sun is the third descendant of the Sun family. A young and immature king also comes into the picture, creating more chaos. This is a Tale of the Three Kingdoms ("Sanguozhi") in which these three men rage war throughout China.

A sci-fi retelling of Wagner's "Ring of the Nibelungen", starring Captain Harlock. The series was first serialized from 1990 to 1991 in Chuukosha Fan, a used car magazine (!). A sequel was published for free directly on Shinchousha's webpage from 1997 to 2000, making it probably the first online manga.

You awake on your back in a forest covered with ash, confused, uncertain. How did you get there? Why does your head hurt so much? Why is a book containing but blank pages strapped to your back? Why are you… a rabbit?

Yes, you’re a rabbit. And you are being chased by a massive wolf. What will you do now?

Centuries in the future, in the year After Colony 195, Earth is surrounded by orbiting space colonies. The colonists are cruelly oppressed by the Earth Alliance, which uses huge humanoid fighting machines called "mobile suits" to control the populace. Behind this tyranny is the secret society called "Oz," which has infiltrated the Alliance military and steered it towards its repressive course. Now, the space colonies are ready to strike back. Five young pilots, equipped with advanced mobile suits called "Gundams," are sent to Earth to wage guerilla war against Oz and its Alliance puppets. The war to decide humanity's destiny begins...

From Chinatown KM:

A collection of oneshots.

1. Mountain Love
A girl, who is under stress to get into a medical school and one day, falls in love with her doctor.

2. Mermaid Is Singing
A boy, who tries to commit suicide (because of certain medical reasons) and a girl who tries to stop him.

3. Autumn Night's Dream
A girl helps an architect to realise his real dream.

4. Echo
A girl who knows the people who killed their class president is unable to express her own thoughts.

5. The Sleeping Time Paradox

Note: In 2000, it won the National Institute for Outstanding Comics Award.