One year into her marriage, Itsuha is suffering domestic violence from her husband. Her only comfort is time spent caring for her frail but gentle father-in-law. One day, feeding him mouth-to-mouth gives him an erection. Telling the embarrassed man that it is simply part of his care, she helps relieve him by hand. From then on, as if desperate to overwrite the pain her husband has inflicted, she repeatedly gives herself to her father-in-law.