A few years after marrying my wife Ai, she recently started worrying about her figure, asking, "Have I gained weight...?" I told her it was fine because she was naturally thin, but she wouldn't listen, and we decided to try out a personal gym together. In the end, I wasn't very good at exercise, so I quit soon after, and it was just my wife who started going to the gym. Just being alone with a muscular trainer made me feel anxious, but Ai's clothes were becoming more and more revealing with each passing day. Being suspicious, I sneaked a voice recorder into Ai's bag, but...