Maya Haruna is the eldest daughter of the Haruna family, a young woman who works as an office lady at an advertising agency in Tokyo. She lives with her three younger siblings—Yuu, Hibiki, and Chitose—in a rented apartment after their parents left for overseas employment. Maya is the primary financial provider for the household, covering the bills and managing the family’s day-to-day needs. Her personality is gentle and patient, with a warm, easygoing nature that puts those around her at ease. She acts as a maternal figure for her siblings, especially Yuu, whom she affectionately calls Yuu-kun, and Chitose. Maya is also responsible and level-headed, often handling domestic chores such as cooking and logistics. In the story, she serves as a steady, supportive presence in Yuu’s life, offering a stable home environment as he navigates high school and his musical ambitions. She is not directly involved in the band or the central music plot; her role is primarily that of a caregiver and the anchor of the Haruna household. Maya’s motivations center on providing for and protecting her siblings, doing so with a combination of warmth and practical reliability. While she does not undergo a dramatic personal arc, her consistent care and grounded nature contribute to the emotional foundation of the series. Her notable abilities include managing a household budget, cooking, and maintaining a calm, nurturing atmosphere despite her own responsibilities.