Andaka and Miyu, close friends since their student days, still hang out as couples. However, Andaka is struggling with trying to get pregnant and has been increasingly dissatisfied with her sex life. Amidst this, Miyu brought up 'AI compatibility diagnosis,' leading the four of them to half-jokingly decide to try 'wife-swapping.' It was supposed to be just watching each other through the camera, but after Ando was raped by Miyu's husband, their hidden sexual perversions were exposed and they went wild...
