Kaibutsu-kun is a rambunctious prince of Kaibutsu Land. On the day of succession to the throne, he is ordered to go to the world of humans by the King of Kaibutsu Land for ascetic training. Kaibutsu-kun and his attendants, Dracula, Wolfman, and Franken, travel to the world of humans and encounter several monsters or humans belonging to the demon group led by Demorina who tries to set the prince of demon back on track and take over the world.