Mirei, a housewife who lives with her husband and daughter. She lived a comfortable life, but she was having an affair because her husband and her night life were estranged. One day, at a love hotel, she accidentally discovers a video featuring her son-in-law, Yoshikazu. Mirei intends to interrogate Yoshikazu for her daughter's sake, but instead finds out about her affair. "If you want to have an affair, let's do it with me!" Despite being her mother-in-law, Mirei, who has beautiful skin and plump big breasts, does not stop her desire for Yoshikazu, and the two continue to have a quagmire domestic affair.
