Marriage Exchange Day 2017: Coveting a Friend's Wife 2017 부부교환의날2017

A married couple, Chiaki and Akira, also suffers from the stress of work and their sex life. A fellow couple, Kaito and Nagisa, who watched this, propose their own secret method of relieving stress, couple swapping. Couple swap sex, more attractive because it's quirky, and more addictive because it's hot.