Taitei no Ken  

Yorozu genkurou, a traveling warrior known for his imposing size and formidable weaponry, stumbles upon what appears to be an extraterrestrial spacecraft while traversing through a dense forest. as he continues on his journey, he encounters various ninjas and ambitious combatants who are after him. however, little does he know that these attackers are actually aliens who have descended onto earth in search of three powerful artifacts made from orichalcum, an alien substance with mystical properties. one such artifact is his very own sword, which has been imbued with the power of this rare material. the quest for these items commences.