"My-HiME" is a 26-episode anime series that blends elements of action, drama, and supernatural themes. The story centers around Mai Tokiha, a high school student who transfers to Fuuka Academy, a prestigious institution with a mysterious undercurrent. Mai and her younger brother, Takumi, are drawn into a hidden world of conflict involving HiMEs, young women who possess the ability to summon powerful entities known as Childs. These Childs are manifestations of the HiMEs' emotions and are used in battles against grotesque creatures called Orphans.

The narrative unfolds as Mai discovers her own HiME abilities, awakening her Child, a fiery phoenix named Kagutsuchi. She is not alone in this revelation; several other students at Fuuka Academy are also HiMEs, each with unique powers and personal motivations. The HiMEs are bound by a secretive organization called the First District, which oversees their activities and enforces a strict hierarchy. The series explores the relationships and rivalries among the HiMEs, as well as their struggles to balance their ordinary lives with their extraordinary responsibilities.

A central plot element involves the "Star of the HiME," a celestial event that occurs every 300 years. During this time, the HiMEs are compelled to compete in a deadly battle, with the last remaining HiME granted a single wish. This competition creates tension and conflict among the characters, as alliances are tested and personal stakes are revealed. The series delves into themes of sacrifice, loyalty, and the consequences of power, as the HiMEs grapple with the moral and emotional weight of their roles.

Key characters include Natsuki Kuga, a stoic and determined HiME with a tragic past; Mikoto Minagi, a mysterious girl with a deep connection to Mai; and Shizuru Fujino, the student council president whose calm demeanor hides a complex inner world. The relationships between these characters drive much of the narrative, with romantic subplots and interpersonal dynamics adding depth to the overarching conflict.

As the story progresses, the true nature of the HiMEs' powers and the First District's intentions are gradually revealed, leading to a climactic confrontation that challenges the characters' beliefs and forces them to confront their deepest fears. The series balances its action-packed sequences with moments of introspection, creating a multifaceted narrative that explores both the external battles and the internal struggles of its protagonists.