Gray and Zire were monsters. Gray was a vampire and Zire was a werewolf. They lived very different lives. Zire grew up in a cave in Mexico. Gray grew in in a mansion in the US. Zire lived with his family but Gray's blood relatives were all dead. Zire could barely walk among the humans. Gray has more experience because of his human appearance, but still found it difficult. One day they meet on completely unexpected circumstances.