sad mother and daughter

Maru lives with his father who works at a factory and his sickly mother Azusa. Wanting her mother to get well soon, Maru supported her mother with all her might, but her father continued to secretly rape her. One day, Azusa's doctor, Nimaru Sasaki, came to visit her and was threatened and raped because he had seen her act with her father. Maru is unable to confess the truth to his mother and is simply frightened. However, Sasaki puts on a fearless smile and approaches his mother, who knows nothing...