Lustful Office Lady Commits Crime(1982)

Shiro wanted to separate from his wife Yuko, who was having many affairs with other men. Then he met his mistress Emi, whom he had separated from three years earlier. This made him decide to leave home and take refuge at his friend Miyagawa's house. When Yuko found out that Shiro and Emi had gotten back together, she asked her male friend Hideo to assault Emi. Shiro saw Emi being violated right in front of his eyes...