Shining the Holy Ark

You play the role of a young swordsman Arthur, who decided to work as a mercenary for various people needing his services. On his first mission, the King of Enrich sends him to a mine, in order to find and punish a renegade ninja who has escaped from him. However, an accident occurs that makes Arthur realize that he'll have to do much more than his usual mercenary assignment, and that there is a true evil in the world that must be defeated at all costs. (Mobygames)