"Fushigi no Maria-kun" is a manga series that blends elements of comedy, romance, and supernatural themes. The narrative centers around Maria, a young girl with a unique ability to transform into a boy named Maria-kun when she sneezes. This transformation is triggered by her allergy to cats, and the duality of her identity becomes a central focus of the story. Maria-kun is confident, outgoing, and popular, contrasting sharply with Maria's shy and reserved personality. The series explores the challenges and humorous situations that arise from her dual identity, particularly as she navigates relationships and daily life.

The plot develops around Maria's interactions with her classmates, especially her childhood friend, Akira, who is unaware of her ability to transform. Akira harbors feelings for Maria-kun, creating a complex love triangle that adds emotional depth to the story. The series delves into themes of identity, self-acceptance, and the complexities of human relationships, all while maintaining a lighthearted and comedic tone. The supernatural element of Maria's transformation serves as a vehicle for exploring these themes, providing both comedic and dramatic moments.

Supporting characters, such as Maria's classmates and family members, contribute to the narrative by adding layers of interaction and conflict. The series balances its comedic elements with moments of introspection, as Maria grapples with the implications of her dual identity and the impact it has on her relationships. The manga's pacing allows for gradual character development, with each chapter building on the previous one to create a cohesive and engaging story. Overall, "Fushigi no Maria-kun" offers a blend of humor, romance, and supernatural intrigue, making it a distinctive addition to the genre.