Mato Katori

Mato Katori is a pivotal educator at Yumegaoka High School, balancing her dual roles as homeroom teacher and diving club advisor with remarkable dedication. Her infectious enthusiasm and approachable personality have earned her the affectionate nickname 'big sister' among students. While she maintains high professional standards during diving training, she reveals a thoughtful and emotionally nuanced side in private moments. Guided by her core philosophy that 'fun comes first,' she shapes the protagonists not only as skilled divers but as individuals who embrace growth with joy and courage.