Yuu Morisawa, a spirited 10-year-old, discovers the power to morph into 16-year-old idol Creamy Mami after an encounter with alien Pino Pino, who gifts her a magical compact. This device lets her summon the wand Kanon and wield abilities like time manipulation, object animation, and summoning, aided by feline alien guides Posi and Nega. Her transformation grants her light purple wavy hair, a mature physique, and a secret double life juggling school, family crepe shop duties, and a meteoric idol career under a one-year magical deadline.

Her childhood friend Toshio Ōtomo fuels a central emotional struggle, developing an oblivious crush on Creamy Mami while overlooking Yuu’s affections. Their dynamic shifts as jealousy gives way to Toshio’s eventual recognition of his feelings for Yuu herself, bridging the divide between her identities. Professional rivalries, notably with established idol Megumi Ayase, challenge Yuu’s ascent, though collaborative performances later reveal mutual respect and solidarity.

The *Curtain Call* OVA caps Yuu’s growth with a pivotal concert where she sheds her magical guise to perform authentically, proving her talent transcends enchantment. This act underscores her journey toward self-acceptance, paralleled by Megumi’s expanded role, highlighting their shared idol-industry trials.

Yuu balances tomboyish exuberance with idol grace, flashing a quick temper—especially toward Toshio’s teasing—yet channeling resilience into kindness, from aiding strangers magically to bonding with animals. Her narrative weaves identity exploration, the weight of responsibility, and fame’s pressures as she harmonizes ordinary life with magical demands.

Across series iterations, Yuu’s transient powers infuse urgency into her evolution, framing her idol tenure as fleeting yet transformative. As a trailblazer merging magical girl motifs with pop-idol storytelling, her legacy resonates in genre successors, cementing her foundational influence.