The Pit of Death (1968)

Kuramoto, who works for a large trading company, is a skilled employee who is well-liked by the company president. He is engaged to an employee named Nishino Etsuko, but he used her for his own career advancement and kills her so that he can marry the company president's daughter. When Kuramoto returns from his honeymoon with his new wife, Etsuko's brother shows up in search of the whereabouts of his missing sister.