In the ordinary life of merchant Banaza, he is summoned to the mystical kingdom of Klyrode, which expects him to fight the threatening Dark Army. However, Banaza does not gain any special abilities upon reaching level one, setting him apart from other hero candidates, and he learns there is no way back to his own world. As compensation for this misfortune, he is banished to a distant forest. Surprisingly, after just one level up, Banaza obtains immense powers, leaving him confused about how to use them.
To avoid drawing undue attention, Banaza changes his appearance and takes the name Flio. While exploring, he encounters a young demi-human girl named Fenrys, who seems to have the same destination in mind. Fenrys attacks him, only to reveal herself as a lupine demon. Thanks to Flio's unparalleled magic, he easily overpowers Fenrys, who then vows lifelong loyalty to him. Despite this, Flio declines to take control over her, and they decide to live together as if married, embarking on a new journey.