Ishibashi-sensei is the physical therapist treating Ritsuko Hanauchi, a young girl whose leg impairment hinders mobility and walking. He delivers professional therapeutic care to improve her physical condition and assist with daily challenges, focusing interventions on enhancing her mobility to directly address her walking difficulties relative to peers. Beyond physical rehabilitation, he provides guidance and encouragement as Ritsuko endures social isolation and bullying from classmates—issues intensified by her overprotective mother’s influence. His role encompasses fostering her resilience and determination to integrate socially, aiding her in developing strategies to pursue acceptance within the school environment.