Chise Hatori, a 15-year-old girl, is introduced as a troubled individual with a tragic past. Orphaned at a young age and ostracized for her ability to see supernatural beings, she feels disconnected from the human world. Desperate and hopeless, she sells herself into slavery at an auction, where she is purchased by Elias Ainsworth, a mysterious mage with a skull-like head and a non-human appearance. Elias takes her to his home in rural England, where he reveals his intention to make her his apprentice and eventual bride.

The narrative explores Chise’s journey as she adapts to her new life, learning about magic, the supernatural world, and her own latent abilities as a Sleigh Beggy—a rare individual with immense magical potential. Elias, though enigmatic and often aloof, becomes a central figure in her life, offering guidance and protection while grappling with his own understanding of human emotions. Their relationship evolves as they navigate challenges together, blending themes of mentorship, companionship, and mutual growth.

The series delves into the intricacies of the magical world, introducing a variety of mythical creatures, spirits, and fae, each with their own customs and dangers. Chise’s encounters with these beings often serve as catalysts for her personal development, as she learns to confront her past traumas and embrace her identity. Key arcs include her interactions with the dragon Ainsel, her involvement in the affairs of the Church, and her efforts to heal a cursed village. These events highlight her growing confidence and her ability to forge meaningful connections with both humans and non-humans alike.

Supporting characters play significant roles in shaping the story. Ruth, a black dog-like familiar, bonds with Chise and becomes her loyal protector. Silky, a household spirit, provides domestic care and emotional support. Figures like Angelica Barley, a skilled sorceress, and Lindel, Elias’s mentor, offer additional perspectives on magic and the responsibilities it entails. The series also explores the darker aspects of the magical world, including the consequences of wielding power irresponsibly and the moral ambiguities of immortality.

Themes of belonging, healing, and the coexistence of humans and the supernatural are central to the narrative. Chise’s journey is one of self-discovery, as she learns to reconcile her painful past with her newfound purpose. Elias, too, undergoes growth, striving to understand human emotions and the complexities of relationships. Together, they navigate a world where magic and reality intertwine, facing challenges that test their bond and their understanding of each other. The series balances episodic storytelling with an overarching narrative, creating a rich and immersive exploration of its characters and their world.