My wife Haruka and I have been married for three years. Recently, she has been trying on outfits she used to wear, but now they are all too tight. So she wants me to go to the gym with her to regain her figure like before. I really don't like working out at all. At first, I indulged her, and I was able to work out for a week, but I couldn't continue and gave up. Only she remains to work out with a tall, muscular trainer who is also very good at talking. I can feel the gap between them growing closer, and the thoughts about him sleeping with my wife keep crossing my mind. I decided to buy a recording device and put it in my wife's handbag. In the evening, when my wife just got home and went into the bathroom, I took out the recording device to check. And then I uncovered the truth....