"In exchange for me keeping quiet about your secret, I want you to play the part of my girlfriend."

Hikasa Mugi is known to others as a "convenient woman" and she acknowledges this herself. Her company prohibits side jobs but her childhood friend and co-worker has been secretly working as a "rental girlfriend". Then one day, Mugi was, at the last minute, made to fill up a job for that friend.

When she reluctantly went for the job, the customer turned out to be a princely hottie named Kamishiro Kaito. Though she somehow managed to complete his request that day, he ended up requesting for her again! Plus, he even turned out to be her new direct supervisor at work!! Now, she's stuck having to become his fake girlfriend in exchange for her not getting fired!? This is the beginning of a romance which started from a lie between a subordinate and her boss.