Mai Kazuki, a young girl from a family steeped in stage magic tradition, dreams of becoming a great magician like her idol, Emily Howell. Her grandparents lead the professional troupe Magic Carat, while her mother, once a talented magician, chose family over her career. Despite this inspiring environment, Mai's natural clumsiness and lack of skill prevent her from joining the troupe professionally.

Her life changes when she encounters Topo, a mirror fairy inhabiting her stuffed flying squirrel doll. Topo grants Mai a bracelet marked with card suit symbols. This bracelet produces a magic wand enabling her transformation into "Magical Emi," an older, confident, and graceful teenage version of herself. As Emi, she commands professional stage presence and performs impossible feats with genuine magic, overcoming her usual ineptitude. This transformation allows her to become Magic Carat's star performer, significantly boosting the troupe's popularity.

However, Mai grapples with internal conflict. Relying on magical powers feels like cheating, undermining her genuine desire to master stage magic through her own effort and dedication. Winning a magic contest as Emi brings only hollow victory, intensifying her dissatisfaction with the borrowed abilities.

Mai maintains a secret double life as Emi, known only to Topo. Her family, friends, and Magic Carat colleagues remain unaware. This secrecy creates challenges, forcing her to balance performances with family obligations and school life.

Her relationships shape her journey. She shares a close, often bickering bond with Sho Yuki, a teenage Magic Carat member she views like an older brother. She remains oblivious to the affections of her classmate Musashi Koganei. At home, she acts as a caring older sister to her energetic younger brother Misaki, who ironically displays more natural magic talent. Her father expresses skepticism about her magical ambitions, prioritizing academics, while her mother understands the allure of performance but chose a different path.

Mai's character evolves significantly. While initially embracing the Emi persona to support her family's troupe and vicariously experience her dream, she increasingly questions the authenticity of her achievements. This culminates in her voluntary decision to relinquish her magical powers and transformation ability. She resolves to pursue her goal of becoming a true stage magician through dedicated practice and perseverance, accepting the challenge of overcoming her natural clumsiness and lack of skill on her own merits.