Samurai Western

In Samurai Western, you assume the role of a young samurai named Kiryu Goujiro, who's traveled to the US all the way from Japan to find his older brother. Goujiro sticks to his bushido code of honor and his belief that the Japanese sword is the strongest weapon in the world, so he seems to fight only with his sword throughout the game. Since Goujiro's outnumbered by gunmen who can pepper him with bullets from yards away, it's a good thing he has a lot of talent with his sword.