Sawatari Izumi and her little sister, Mitsuki, ran away from home. In order to look for part-time jobs, they wandered around the town. However, all the shop owners refused to hire them.

Then, they happened to see a poster looking for resident housekeepers. It was done by Nakabayashi Yoshitaka who had lost his parents in the accident, and he became quite alone. Being sympathized with him, they were going to be help him.

However, Yoshitaka is very pervert person who had a cosplay fetish. He made them wear obscene maid uniforms. Izumi got angry, while Mitsuki enjoyed wearing them. Yoshiki started to enjoy being a master. Then, a pet crocodile which liked girls appeared...