Misaki Suzuhara, a 12-year-old girl, moves to Tokyo to live with her aunt after her mother, Shuko, leaves her in the care of relatives. Upon arriving, Misaki becomes fascinated by Angelic Layer, a high-tech battling game where players control customizable dolls called "Angels" through mental commands. The game involves strategic combat in a designated arena, with players competing to outmaneuver and defeat their opponents' Angels. Misaki, inspired by a skilled player she observes, decides to create her own Angel, naming her Hikaru after a character from a childhood story.

Misaki's journey into Angelic Layer begins with her meeting Ichiro "Icchan" Mihara, a quirky scientist who helps her design and customize Hikaru. Despite being a novice, Misaki demonstrates remarkable talent and intuition, quickly rising through the ranks of the game. Her natural aptitude for strategy and her deep emotional connection to Hikaru set her apart from other players. As Misaki competes in various tournaments, she encounters a diverse cast of opponents, each with their own motivations and backstories, including the enigmatic Hatoko Kobayashi, a young prodigy, and the stoic Kaede Saito, a top-tier player with a mysterious past.

Throughout the series, Misaki's growth as a player parallels her personal development. Her determination to improve in Angelic Layer is driven by a desire to reconnect with her mother, who is revealed to be a key figure in the development of the game. Shuko's absence and her involvement in Angelic Layer add emotional depth to Misaki's journey, as she seeks to understand her mother's choices and prove her own worth. The narrative explores themes of perseverance, self-discovery, and the bonds between players and their Angels, emphasizing the importance of trust and emotional investment in achieving success.

The supporting characters, including Misaki's friends and rivals, contribute to the richness of the story. Ohjiro Mihara, Icchan's brother and a commentator for Angelic Layer matches, provides insight into the game's mechanics and strategies. Kotaro Kobayashi, Hatoko's older brother, serves as a mentor figure to Misaki, offering guidance and encouragement. The interactions between characters highlight the competitive yet supportive nature of the Angelic Layer community, where players challenge each other to grow while forming meaningful connections.

As Misaki advances in the game, she faces increasingly difficult opponents, culminating in a climactic showdown with the reigning champion, Shuko Suzuhara. This final battle not only tests Misaki's skills but also serves as a pivotal moment in her relationship with her mother. The resolution of their conflict underscores the series' central themes of reconciliation and the power of determination. Through her experiences in Angelic Layer, Misaki learns valuable lessons about resilience, the importance of pursuing one's passions, and the strength of familial bonds.