"I'm so worked up, I might ruin her if I'm not careful."
"Is this her first time having this done to her?"

One day, Maho is suddenly assigned to be the CEO's secretary. Kaito, the young and talented CEO, is none other than her first love! A few days after becoming his secretary, Maho gets so drunk that she loses her memory of the night they spent together. In the morning, he tells, "Starting today, you and I will have that sort of relationship." Does this mean... she is his mistress? Kaito is rumored to be a cold man, but his passionate hugs, sweet whispers, and mind-numbing embrace make it seem like he genuinely loves her. Though she knows she's just his mistress, Maho's body and soul melt in his hands... Then, when she attends a party at an embassy as his plus-one, she's suddenly hit on by the blond-haired, blue-eyed handsome Evans!