Saryu Usui lives happily with her husband, Keisuke. Taking advantage of Keisuke's frequent absences for work, her father-in-law, Kazuo, constantly demands money from her. One day, Kazuo witnesses a door-to-door salesman breaking into the Usui residence and assaulting Saryu. Rushing in to drive the intruder away and save her, Kazuo surprises Saryu with an unexpected demand of his own instead of comfort—sparking a shocking new turn of events filled with lust, coercion, and humiliation.