Hoshi no Ken

Nagahisa Amachi is a master of the sword working as a hired sword in search of countries involved in a war to make a living. Besides that, he's also searching for one thing. A man !! A man with a scar on his face !! A man who stole his father's precious sword !! A man who brutally murdered his family with that very sword !!

(Source: MangaUpdates)