Doushirou de Gozaru(2004)

Doushirou de Gozaru

When he was three years old, Doushirou's father took him away to America and raised him in the Nevada countryside. Twelve years later he returned to his mother in Japan, and for some reason he's become a like real samurai! After growing up on warrior tales, how will Doushirou deal with life as a modern Japanese high school student?