In a world where monsters attacking cities has become a normal thing over the past 10 years, Johnny Monster is a hunter of these monsters. While most monster hunters kill these beasts on the spot, Johnny captures them to deal with them out of sight. All isn't as it seems however, Johnny's way of dealing with the monsters is to take them to his underground paradise. Johnny speaks the monster language and takes care of these beasts. One of them may even be his mother.