An Unfulfilled Housewife: The Price of an Affair　 (1999)

Rinko, a refined married woman, was addicted to using a message service to find men. She found herself increasingly bold in the pleasure she couldn't tell her husband about, but a man blackmailed her with secretly filmed footage of her trysts, demanding not only money but also her body. She endured repeated humiliations. Unable to bear it any longer, Rinko decided to follow the man. She then discovered that in his apartment building. She is shocked to discover her husband's mistress, and her stubbornness continues relentlessly, while the shadow of a stalker appears...