Buronson

From Viz: One day, a wanderer appears out of the wasteland to bring justice to the guilty and hope to the people - a warrior named Ken, a man who bears seven scars upon his chest and holds the secret of a mysterious martial art known as Hokuto Shinken, the Divine Fist of the North Star.

Following a cataclysmic nuclear war, the world teeters on the brink of complete destruction. Civilization is polarized into a degenerate society where opposing packs of marauding scavengers prey on helpless, homeless nomads. For those who are lucky enough to survive the constant brutality and danger, it is a bleak existence. Life and death blur into abstractions. The only hope…

Mysterious assassin Mayo, a Japanese man in Malaysia, will kill anyone you want for just five dollars. Of course, he'll kill you for five dollars too, but doesn't that just even the score? With outcast allies at his side and formidable enemies against him, Mayo is the only one who can stop a conspiracy that stretches around the world!

Tatsumi Karasawa became the owner of a host club called "Shinjuku Sokai" in just two days. He leads a group of amateurs who aren't afraid of gangsters, police, or so-called "professional" organizations. Fearlessly, he walks the difficult path straight to the top. In 2002, "Heat" won the 47th Shogakukan Manga Award in the general manga category.

Taking place in 1930s Japan and China, Kasumi Kenshiro (the uncle of Kenshiro from Hokuto no Ken) is forced to leave his teaching job and settle an old gang rivalry with the help of his martial arts. Along the way, he meets the son of one his triad buddies, an old flame, and a mysterious old man who teaches him new techniques which will assist him in his quest.