My wife recently started dieting with the help of online videos. The trainer featured in them is Mizuki, who apparently runs her own private gym, so my wife and I decide to try it. Mizuki manages the gym alone and gives us attentive training, but her revealing neckline and habit of standing unusually close make it hard for me to keep my composure. Noticing my reaction, she tempts me with an offer for private one-on-one lessons...