Lei a ordinary boy who became a adventurer and got stronger because of the death of his family and trying to survive alone.on his adventure he save a village from a monsters and meet a girl named gianna who's also want to be an adventurer she decided to follow Lei in his adventure but Lei refuse because Lei doesn't want to lose someone close to him. But gianna always followed him in his adventure so Lei decided to let her come in his journey but they promised each other to not die in this adventure