Uniho, the Unholy Hero and his Tiring Adventures

In the lands of Karinosa, humans and demons are wandering on its earth. It has been said that Demon Lords have been attacking and conquering lands of the humans. Uniho, a 'normal' guy who just guards his hometown boringly everyday, is going to set out to his adventure against the Lords...because of people push him to. His boring life will soon be over, but his tiring life will soon begin.