Nodoka, who placed second in a national bodybuilding contest, begins a special training regimen devised by her middle-aged coach in order to take first place. The training involves a sexually harassing "air squat" where she must maintain a squatting position with a penis inserted 1cm inside her. Although she initially endures it to build muscle, after being given an aphrodisiac and subjected to intense teasing with only the tip inserted, Nodoka gradually begins to crave the large penis and goes wild, thrusting deep into her vagina...