Read Barbarian Quest Manga:
The greatest warrior of the Boulder Axe Tribe, Urich. He accomplished what others in his tribe could not, and went beyond the ‘Sky Mountain Range’. What he saw beyond the mountains was, Different clothing being worn, different languages being spoken, and unfamiliar people in iron-clad armor. “So, the realm past the mountains wasn’t just a spirit world for the dead!” An uncharted more.. world, and the one who faces it, Barbarian Urich is headed towards the civilized world!