Since her husband left home to be with another woman, she has been living alone with her son. Her mother, Azusa, is struggling alone to protect the family. Ryota feels guilty when he sees Azusa trying to act cheerfully so as not to show her weakness to her son. Is there anything he can do for his mother? After much thought, Ryota comes up with his own way of showing his filial piety. That is to comfort Azusa with his body as a man.