Once upon a time, the world was facing destruction by an evil being called the "Evil Dragon". However, a brave man defeated the evil dragon and saved the world. Since then, nearly 200 years have passed. In Masat, one of the many maze cities, there lived a man called "Incompetent". His name was Laust, and his profession was a healer. Because of his incompetence, Laust was despised, used and abandoned by other adventurers. His days were repeated day after day. One day, a girl appeared in front of Laust. Her name was Narsena, and her profession was a martial artist. Narsena said to Laust, who had just been expelled from the team: "Brother, are you willing to team up with me?" Now, the adventure of Laust and Narsena has begun.