Marital Exchange Swapping The Best Friend's Husband Is The One With Whom You Have The Best Carnal Chemistry.

Waka and Miyu have been close friends since their school days, and even now, their families are close, with both couples socializing together. However, Waka has been troubled by fertility issues, and her dissatisfaction with her sex life has been growing. Amidst this, Miyu brings up an "AI compatibility diagnosis," and half-jokingly, the four of them decide to try "wife swapping." They were only supposed to watch each other's interactions through a camera, but when Waka is raped by Miyu's husband, it triggers the release of their hidden sexual desires, and they spiral out of control...