tragedy

Kengan Ashua

Since the Edo periods of Japan, gladiator arenas exist in certain areas. In these arenas, wealthy business owners and merchants hire gladiators to fight in unarmed combat where winner takes all. Toki Taouma, nicknamed "Ashura", joins these arenas and devastates his opponents. His spectacular ability to crush his enemies catches the attention of the big business owners, including the Nogi Group chairman, Nogi Hideki.

Shamo

At the age of sixteen Ryo Narushima was a genius and looked to have no trouble of getting into Tokyo University and joining the elite of society. However, that summer something cracked inside Ryo's head. With a small knife he brutally murdered both of his parents only leaving his sister alive and cowering in a corner. It is at this grotesque incident that our story begins. Extra Note: At volume 20, the series changed publishers, which created a restart of the chapter numbers.

Rikudou

From MangaHelpers: Riku experienced a lot of pain and tragedy in his early life. After his father's death, a former-boxer Yakuza man taught him how to do a basic punch, and that punch saved his life when he had to defend himself from his mom's drug dealer. He ended up taking the drug dealer's life, marking him as a killer. Criminals continued to come after him, leading to more tragedy for the people who attempted to care for him. All of this drove him to ask that same former boxer to teach him to become stronger, which led him to a rundown gym, his door to the world of pro boxing!

Veritas

Gangryong is a high schooler; unlike others, he has always had a dream of being the strongest. One day he meets Youcheon, who teaches him a powerful skill. One year later, people come to see him and announce that his 'master' is dead. Because he was his only student, Gangryong has to follow them and go to a school where everybody has supernatural powers.

Inu Yashiki

Inuyashiki has a family, a wife and two kids, none of which care about him. When he learns that he has only three months to live he realizes that the only one who will miss him is his dog. Shortly after this realization he is killed in a crash landing by aliens. He is rebuilt by them as a machine with a human exterior. How will his life change now that he isn`t human.";

Attack On Titan

Several hundred years ago, humans were nearly exterminated by giants. Giants are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a city protected by extremely high walls, even taller than the biggest of giants. Flash forward to the present and the city has not seen a giant in over 100 years.

Berserk

Gats, known as the Black Swordsman, seeks sanctuary from the demonic forces attracted to him and his woman because of a demonic mark on their necks, and also vengeance against the man who branded him as an unholy sacrifice. Aided only by his titanic strength gained from a harsh childhood lived with mercenaries, a gigantic sword, and an iron prosthetic left hand, Gats must struggle against his bleak destiny, all the while fighting with a rage that might strip him of his humanity.

Black Lagoon

Lock n' load with the worst soldiers of fortune ever to hit the high seas of Southeast Asia! Aboard their World War II era torpedo boat, the Black Lagoon, Dutch the Boss, Benny the Mechanic, Revy Two Hand, and Rock, the salaryman from Japan, deliver anything, anywhere. In the dangerous underworld of the Russian Mafia, Chinese Triads, Colombian drug cartels, crazed assassins, and ruthless mercenaries, it's hard to know who to trust. But if you've got a delivery to make, and you don't mind a little property damage along the way, you can count on the crew of the Black Lagoon.

Tokyo Ghoulre

In Tokyo, an unchanging despair is lurking. Mysterious man-eating beings, ghouls, run rampant in Tokyo. Living hidden during everyday life, the existence of ghouls, whose true identities are shrouded in mystery, permanently terrorizes Tokyo's residents. At CCG, the sole institution that investigates and resolves cases related to ghouls, Haise Sasaki has been assigned a certain mission. While dealing with the unruly four problem children known as "Quinx", has Haise's days of suffering begun?

Tokyo Ghoul

Strange murders are happening in Tokyo. Due to liquid evidence at the scene, the police conclude the attacks are the results of 'eater' type ghouls. College buddies Kaneki and Hide come up with the idea that ghouls are imitating humans so that's why they haven't ever seen one. Little did they know that their theory may very well become reality.