I've been married to my wife Haruka for three years now. Haruka has been concerned about her figure for the past three months. At first, we went together, but I quit after a week, and only my wife has continued to go. The gym is privately run, and she is alone with a muscular male trainer during training. I can't help but feel uneasy about the growing distance between my wife and the trainer... And as my wife's appearance becomes more and more exposed each day, I become suspicious, so I sneak a recorder into her bag.