Over 200 years ago, the world faced near destruction at the hands of a malevolent entity known as the "Evil Dragon." However, a courageous hero emerged, defeated the dragon, and saved humanity from ruin. In the present day, in the labyrinthine city of Maattat, a man named Raust lives a life of hardship. Known as a "useless" healer, he is frequently scorned, exploited, and abandoned by fellow adventurers due to his perceived incompetence. One day, a martial artist named Narusena, a young woman with a determined spirit, approaches Raust after he has been expelled from yet another team. She offers him an unexpected proposition: "Hey, would you like to form a party with me?" With this invitation, Raust and Narusena embark on a new journey together, setting the stage for an adventure that may redefine their destinies.