Slave Widow
After her husband's suicide, young and beautiful Mitsuko Fuji feels alone and helpless -- until one of her husband's major creditors, Mr. Kito, offers a sympathetic ear and a cancellation of all debts. However, Mitsuko soon learns that Kito's intentions are anything but pure, as she's forced to become his personal concubine. Her only, improbable hope for redemption lies with her one true admirer: Kito's very own son.
Starring Noriko Tatsumi, Naomi Tani, Mari Iwai, Michiko Yamanaka, Tadashi Oizumi, Suzuko Takamura, Masayoshi Nogami
Watch "Slave Widow" on Amazon released in 1967. It's a drama and romance movie, and has a rating of 6.3 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.