Shura no Mon

This story is about Mutsu Tsukumo, a young and normal looking youth who challenges great foes to prove that his style of fighting is the best in the world. His Ryuha, or fighting style, is called Mutsu Enmei Ryu. A style that is said to have never lost in its 1000 year history. Tsukumo not yet a perfect fighter also increase his strength as the story progresses.

(Source: MangaUpates)