Izumi Sawatari and her younger sister, Mitsuki Sawatari, have run away from home and are in need of employment. The only jobs available are as maids in the mansion of 14-year-old millionaire, Yoshitaka Nakabayashi. What seems like simple work is soon revealed to be far more than the girls bargained for when they find Yoshitaka to be an authoritative employer who demands they call him “Master”.
After running away from home, Izumi and Mitsuki Sawatara are looking for jobs. They arrive at a huge mansion where they find a potential employer to be 14-year-old Yoshitaka Nakabayashi, who turns out to be a dominating perv!
Izumi and Mitsuki wake up in Yoshitaka's garden. He agrees to let them live at his mansion as long as they agree to be his maids again, wear revealing dresses, and obey all his orders.
Izumi and Mitsuki go to school with Yoshitaka. A student has fallen for Yoshitaka; Izumi decides she needs to know how much of a pervert Yoshitaka is and the only way she can do that is by winning the contest being held for Yoshitaka's love.
Izumi's problems keep piling up. In addition to Yoshitaka's attention, Anna has become enamored and wants to become a maid, too. Things get even worse when the Mitsuki Bodyguard Squad take over the mansion and Izumi, Yoshitaka, and Anna must fight their way back in.
Izumi's and Mitsuki's parents arrive at the mansion to convince the girls to come back home. They also have objections to their daughters being maids all alone in the house with Yoshitaka. Mitsuki comes up with a contest: They will go or stay with whoever can win over Pochi and catch Izumi.
Summer Festival has arrived, and Yoshitaka, Izumi, Mitsuki, and Anna go to enjoy the festivities. Things get a little frantic when Mitsuki suddenly goes missing. Later, they come across Yoshitaka's parents' grave. Yoshitaka's father's spirit is very angry with his son for leaving some rude comments. As punishment for Yoshitaka, his father plans to take Izumi away from him.
Izumi is furious when she discovers that Yoshitaka has planted hidden cameras all around the mansion to take pictures of her. Though she wants to leave, she is reminded of the huge debt she still owes and must stay.
With the others out of the house and her father in the hospital, Izumi must watch after her youngest sister, Karin. Izumi allows Karin to play dress up in one of the maid outfits. When the others return, Izumi must try to keep Karin out of Yoshitaka's site until she can send her home, lest he make her a maid, too.
Romance is in the air when Yoshitaka and the girls go to beach. A pretty girl named Alicia has caught Yoshitaka's attention, while Pochi becomes smitten with a female alligator by the name of Ellen. Izumi is about to have her first idol performance.
Izumi receives a big pay check from her performance and is now able to clear her debts with Yoshitaka. Seichirou, Yoshitaka's cousin who is also an orphan and heir to a large fortune, says that he wants to help Izumi get away from Yoshitaka. A contest is set up between the two, with Izumi as the prize.
Things just aren't the same when Izumi and Mitsuki leave, including Yoshitaka himself.
The girls find Yoshitaka in bed, his spirit broken. Izumi accepts the wager from Takami and must find the safe containing Yoshitaka's most prized possession. Izumi is successful, but Takami tries to run off with both the deed and Mitsuki.