Raul Chaser, a young man who aspired to become a hero, fails to achieve his dream after the Demon Lord is unexpectedly defeated, rendering hero training academies obsolete. Forced to abandon his aspirations, Raul reluctantly takes a job at a magical appliance store called Leon Demon Lord, where he works as a sales clerk. His mundane life takes a turn when Fino Bloodstone, the daughter of the defeated Demon Lord, arrives at the store seeking employment. Unaware of her true identity, Raul and his coworkers hire her, leading to a series of comedic and chaotic situations as Fino adjusts to human society.

Fino’s naivety and lack of understanding about human customs create frequent misunderstandings, often resulting in humorous or awkward scenarios. Despite her royal lineage, she is earnest and hardworking, gradually forming bonds with her coworkers, particularly Raul. As the story progresses, Fino’s presence disrupts the store’s routine, with her demonic powers occasionally causing unintended consequences. Raul, who initially struggles with his disappointment over his failed hero career, begins to find purpose in his new role and develops a protective attitude toward Fino.

The series explores themes of identity, adaptation, and finding meaning in unexpected places. Supporting characters, such as Raul’s sharp-tongued coworker Lapis and the store’s eccentric manager, add depth to the narrative, contributing to both comedic and heartfelt moments. The dynamic between Raul and Fino evolves as they navigate their contrasting backgrounds, with Raul’s residual hero instincts often clashing with Fino’s demonic heritage. The story balances lighthearted humor with occasional moments of introspection, creating a blend of fantasy, comedy, and slice-of-life elements.