Lucas is a guy who does not seem to go very well, however, he's about to discover a great secret that will change his life forever. During a Halloween party, Lucas will discover that he is not a normal human, but he is a monster! This will lead him to rethink his life, running away from home and undertaking an adventure to the island of monsters to discover his roots. There, Lucas will have to deal with a lot of dangers and monsters, discovering that being a monster is not something really strange, it's just a way to belong a new type of family.