"But my company doesn't allow side jobs, right?" It all started when a scheming heir found out about her weakness -- Haruka (25), an office lady, is a frugal girl who needs money for certain reasons. While the female employees are excited about Kamiki Yuujin, the heir of the company who has been seconded from the head office, Haruka has no interest at all. However, she ends up exploding in anger at Kamiki, who has an overbearing attitude and seems to treat money with little regard. When she heads to a luxury tower apartment where a new client lives as a housekeeper as per usual, it is Kamiki who appears there...! Moreover, he has used his money to ask Haruka to be his "live-in housekeeper"...? The mismatched cohabitation of the heir and the commoner begins, one floor below the other in a tower apartment building! 私が、腹黒御曹司の”専属家政婦になるなんてーーー!?” OL・春花(25)は、とある事情でお金が必要な節約女子。本社から出向してきた御曹司・神木遊人にも全く興味ナシ！だが、高圧的でお金を軽んじるような態度の神木につい怒りを爆発させてしまう。そんな春花が、いつものように副業のハウスキーパーで新規客の住む高級タワーマンションに向かうと…そこに現れたのはまさかの神木！「うちの会社、副業禁止だけど？」しかも、神木は金に物を言わせて【住み込みの家政婦】として春花を指名してきて…？