Kayo Arisugawa is Alice's mother and a professional author. Following her recent divorce from Kenji Kuroyanagi, she and her daughter relocated to a new town, moving into a new home as Alice transferred schools. As a single mother, Kayo faces financial constraints but prioritizes her daughter's interests, specifically Alice's ballet training, willingly spending money to support it. This demonstrates her dedication as a parent. She actively seeks a significant presence in Alice's life, reflecting deep concern for her well-being and development.

Her interactions with Alice reveal that Kayo's well-intentioned involvement sometimes embarrasses her teenage daughter, particularly due to Kayo's flirtatious behavior. This adds tension but also highlights Kayo's approachable and emotionally expressive nature. Despite the challenges of their new circumstances, her efforts to remain engaged underscore her adaptability and persistent maternal support.

The divorce and move profoundly impact the household. Kayo navigates the complexities of single parenthood while managing her writing career. Her role centers on providing stability and encouragement for Alice during this period of adjustment, emphasizing her resilience and focus on familial bonds.