Hell Kindergarten

The main character, Kiichi-kun, has a constitution that makes himself and those around him unhappy, and because he made Sakura-chan, who he has feelings for, a debt of 1 billion yen, he offers an hourly wage of 100,000 yen "Jigoku Kindergarten". decided to start a part-time job. However, it turned out to be a kindergarten where devilish children who plan to conquer the world gather.