As an ordinary new employee who joined a major underwear manufacturer, I was assigned to a development department full of beautiful women who make sexy underwear! In order to advance to the Langeria Kingdom, which has the world's No. 1 possession rate of sexy underwear, I was chosen to test sex with my ideal! - For the development of a new product, a demonstration of sweet sex with her busty boss, Mr. Watanuki, has begun, and what will happen to me? Promising soft breasts creator Karl-sensei presents! A series of harem office love woven by erotic underwear has started ♪