"Kiki's Delivery Service" centers on Kiki, a 13-year-old witch-in-training, who embarks on a year-long journey to live independently in a new town, as per witch tradition. Accompanied by her talking black cat, Jiji, Kiki settles in the coastal city of Koriko, where she establishes a delivery service using her broom-flying abilities. Her business begins modestly, but her determination and kindness gradually earn her the trust and friendship of the townspeople.

The narrative explores Kiki's struggles with self-doubt and the challenges of adapting to a new environment. Early on, she befriends a kind baker, Osono, who offers her a place to stay and helps her start her delivery service. Kiki also meets Tombo, an adventurous boy fascinated by aviation, who becomes a significant figure in her life. Through her interactions with the townsfolk, Kiki learns valuable lessons about responsibility, perseverance, and the importance of community.

As the story progresses, Kiki faces a personal crisis when she temporarily loses her ability to fly, a metaphor for her waning confidence and sense of purpose. This setback forces her to reflect on her identity and rediscover her inner strength. With the support of her friends and her own resilience, Kiki eventually regains her powers and reconnects with her passion for flying, symbolizing her growth and newfound independence.

The film balances moments of lighthearted humor, such as Jiji's witty commentary, with deeper themes of self-discovery and the transition from adolescence to adulthood. Kiki's journey is not just about mastering her magical abilities but also about navigating the complexities of life, relationships, and personal growth. The story concludes on a hopeful note, with Kiki embracing her role as a witch and finding her place in the world.