"Mahōtsukai Sally" centers on Sally, a young princess from the magical kingdom of Astoria, who ventures to the human world to experience life among ordinary people. Disguised as a human child, she enrolls in an elementary school and befriends two classmates, Yoshiko Hanamura and Sumire Kasugano. Sally’s magical abilities, inherited from her royal lineage, often lead to whimsical and humorous situations as she navigates daily life while keeping her true identity a secret.

The narrative unfolds through episodic adventures, blending slice-of-life elements with fantasy. Sally frequently uses her magic to help her friends or resolve problems, though her spells sometimes result in unintended consequences. Her powers include teleportation, transformation, and conjuring objects, which she employs with a sense of curiosity and innocence. Despite her magical prowess, Sally strives to understand human emotions and relationships, often learning valuable lessons about friendship, kindness, and responsibility.

Supporting characters include Sally’s loyal companions, Cab, a mischievous magical creature who serves as her advisor, and her father, the King of Astoria, who occasionally checks on her progress. The series also features recurring antagonists, such as the bumbling witch Majo Ruka, who seeks to disrupt Sally’s adventures but is often outwitted. The dynamic between Sally and her friends forms the emotional core of the story, emphasizing themes of camaraderie and personal growth.

The plot maintains a lighthearted tone, with each episode presenting a self-contained story while contributing to the overarching narrative of Sally’s journey of self-discovery. The series balances humor, fantasy, and heartfelt moments, creating a timeless appeal that resonates with audiences of all ages. Through its imaginative premise and endearing characters, "Mahōtsukai Sally" remains a foundational work in the magical girl genre, influencing subsequent series with its blend of magic and everyday life.