A holy princess named Mil possesses divine powers that she uses to bless adventurers in her father's kingdom. She has always dreamed of going on her own adventure after hearing their stories of dragons and dungeons, but she is confined to a monotonous life in the castle. Her fate changes when she is suddenly kidnapped by the Demon King and forced to use her powers to aid his forces instead.

However, the novelty of life in the Demon King's Castle quickly fades, and she finds herself trapped in yet another dull routine. Determined to escape the boredom and achieve her dream of adventure, she decides to grow strong enough to break free. The castle is filled with demonic combat instructors, cursed weapons, and tomes of evil spells, so Mil begins training with forbidden magic to achieve her goal.

After escaping the Demon King's Castle, Mil travels in reverse compared to a typical hero's journey, with the castle serving as her starting point where she completed her tutorial and obtained powerful equipment. She meets a villager named Yulia and unlocks her hidden potential, granting her permanent enchantment abilities. Mil also encounters characters like Kuro, who appears to be a legendary dragon in disguise, and Crowell, a demon instructor whose antics surprise even the Demon King. The story follows her journey through various villages as she collects companions and continues her adventure in an unconventional direction.

The main character Mil is a holy princess who has been sheltered her entire life and lacks common sense about the outside world, having been treated as an honored guest both in her father's castle and the Demon King's castle. The Demon King himself is a character who seems accustomed to Crowell's unusual behavior and serves as the initial captor who inadvertently provides Mil with the resources she needs to pursue freedom. The setting includes a fantasy world with RPG-like elements such as stat windows, leveling systems, and talent unlocking mechanics.