Earwig is a clever and cheeky young girl living at St. Morwald's Home for Children. She enjoys having things her way and uses her wits to manipulate others to get what she wants. One day, she is unexpectedly adopted by a strange couple, Bella Yaga and Mandrake, who take her to their mysterious house filled with magical secrets. It quickly becomes apparent that Bella Yaga is a witch, and Earwig is expected to be her assistant, managing tasks far different from her routine at the orphanage. This new lifestyle tests Earwig's adaptability and cunning as she navigates a world brimming with sorcery and whimsical dangers.

Determined not to lose her independence, Earwig devises ways to outsmart Bella Yaga while uncovering the enigmas of her new home. She discovers a talking cat named Thomas, who becomes her reluctant ally in unveiling the true nature of the household's magic. As Earwig learns more about the magical artifacts and spells around her, she begins to unlock powers of her own. The new bonds she forms drive her quest to understand her mysterious past and realize her unique potential in this strange home full of enchantments.