Hanna has been a good employee for the past ten years, but she had enough. After knocking her boss when tried to harass her, she was immediately being fired. While walking home alone and drunk, she heard a baby on a trash can, and the next morning she just wake up with a cute little demon at the top of her chest. Turns out that baby is a baby demon is from the devil from another world who’s hiding himself while he’s still recovering from the last battle he had. After convincing and paying Hanna with jewelry he found it in his pocket. Hanna agreed to babysit him until he fully recover.

She thought babysitting a demon from the other world is easy enough, not until one by one his enemy is just pop up to her house and tried to destroy everything she own, including their world