"Chibi Devi!" centers around Honoka Tamura, a high school girl whose life takes an unexpected turn when she encounters a mischievous demon named Mao. Mao, a small and childlike demon, is sent to Earth to learn about human emotions and experiences. Despite initial reluctance, Honoka agrees to let Mao stay with her, leading to a series of comedic and heartwarming situations as Mao navigates the complexities of human life.

The narrative explores the evolving relationship between Honoka and Mao, highlighting their contrasting personalities. Honoka is responsible and kind-hearted, often acting as a caretaker for Mao, while Mao is playful, curious, and occasionally prone to causing trouble. Their interactions are filled with humor and occasional misunderstandings, as Mao’s lack of familiarity with human customs leads to chaotic yet endearing moments.

Throughout the series, Mao’s presence influences Honoka’s daily life, bringing both challenges and unexpected joys. The story also introduces other characters, such as Honoka’s classmates and friends, who become involved in Mao’s antics. These interactions further emphasize themes of friendship, empathy, and the blending of different worlds—human and demon.

The plot is episodic, with each episode focusing on a new situation or lesson for Mao, often tied to human emotions or cultural practices. Despite its lighthearted tone, the series occasionally touches on deeper themes, such as the importance of understanding others and the value of compassion. The dynamic between Honoka and Mao serves as the core of the story, driving both the comedic and emotional elements of the narrative.