Hitozuma kaidan: In'yoku musebinaki

Original title: 人妻怪談　淫欲むせび泣き

When housewife Fumino wakes up in the middle of the night, she witnesses a mysterious woman in red clothing in her home. When she follows the woman's back, she sees her own back, and when she goes up the stairs, she sees her husband having sex with a woman who looks just like her.