Momoko lost her husband five years ago. Her only purpose in life was her daughter's happiness, but her view of her daughter's boyfriend, Haruto, began to change day by day. Her workplace is full of women, and her daughter is the only person at home, so he is the only man of the opposite sex who comes into contact with Momoko... But one day, as she is masturbating, Momoko suppresses her feelings because he is her daughter's boyfriend, and Haruto sees her doing so. Haruto, who only saw Momoko as her mother, gradually begins to become aware of Momoko. Then, one day when her daughter goes out for a dress meeting, the two cross the line...