After her husband, who had an affair, left home, Aoi found herself living alone with her son. She's been struggling to keep the family together, putting on a brave face for her son, even though she's hurting inside. Ryota felt deeply sorry for his mother, wondering what he could do for her. After much deliberation, Ryota came up with his own way to show his filial piety: to comfort his mother with his body as a man.