The married woman Iori Tsukimi comes to the gym for weight loss. The gym trainer Yoshida, who loves breasts more than meals, can't help but be captivated by Tsukimi's chest despite telling himself "I shouldn't look!" As Tsukimi changes into sportswear, Yoshida teaches her stretching, weight training, and cycling while getting an erection. Tsukimi's sportswear, soaked in sweat, becomes so transparent that it's barely even there anymore...
