The main character has a bitter tongue, but he is actually kind in heart. One day, he finds some animals being in trouble. He can't leave them like that and helps them. Several days later, the animals he saved the other day suddenly visit his house. In his amazement he can only ask "Why maid uniform? Oh, how did you become human...?"
He tries to refuse, but he finally allows them to stay at his house. At first, he doesn't know what to do and just gives them simple requests. However, his requests gradually get bolder and bolder....

[Edited from Himeya Shop]