Yuna Aino works as a receptionist at the company where her husband is employed, and they are known throughout the office as the perfect married couple. One night, she applies a rumored aphrodisiac drug to her groin before having sex with her husband. The drug reacts badly with her body, causing a medical condition that forces her doctor to instruct her not to wear underwear. Unable to take time off work the next day, Yuna is forced to continue her duties without panties. Soon after, a mysterious guest visits the company, and Yuna finds herself drawn into an unexpected and intense situation.