Sayo Shiina

As Mahiru's birth mother, Sayo's marriage to her husband Asahi was nothing more than a loveless arrangement built on mutual interests. She never cherished her daughter, instead viewing Mahiru as a burden that weighed down her life. For years, she neglected her parental duties entirely, offering only material support while remaining emotionally absent. This profoundly cold mother-daughter dynamic stands as the root cause of Mahiru's childhood loneliness and lasting psychological wounds.