With her father away on a work assignment, it's just mother and son living alone at home. The mother has a passive personality, easily swayed by others—she can't refuse door-to-door salespeople and often ends up buying unwanted items. One day, the son begins directing lustful glances toward his mother, gradually becoming aware of her as a woman. Unable to reject her son's increasingly lewd requests, the mother finds herself drawn deeper into an intimate relationship with him. An ordinary daily life slowly spirals into a whirlpool of forbidden emotions.