JUTA-007 - Stepmom after the inheritance gets blackmailed and broken by her stepson

Kazuko married for the inheritance. Initially playing the role of a loving wife and stepmother, her true colors are revealed when her stepson catches her masturbating and cheating with an insurance agent. Discovering she's only after his father's fortune, the son turns the tables by installing hidden cameras throughout the house, using the footage to blackmail and break her.