Andou is a plain, awkward young woman who works for a cosmetics manufacturer. She is intimidated by Shibuya Yamato of the Product Development Department, who is good-looking but rude and arrogant.

At a staff meeting Shibuya announces a new product that he has developed, a nutritional supplement to make the skin beautiful. He plans to bring it to market even though it has only been tested on men. He challenges the staff to volunteer to be "monitors" (product testers.)

Andou tries the supplement and it does indeed make her skin look awesome, but it has the unfortunate side effect of causing overwhelming sexual urges. Worse, Shibuya insists that she continue to serve as product tester until he perfects the supplement!