First Cuckold 6 -The Wife Who Is Driven Crazy By Another Man Behind A One-Way Mirror- Hana Kano

A married couple runs a soba restaurant. They have regular customers and business is steady. But their marital life has been sexless for three years due to the husband's infidelity. One day, the wife, Yasuko, can't hide her irritation when she sees her husband forcefully canceling the newspaper subscription. The husband, suspicious that his wife might be having an affair, hires a detective.