In another time, another world, there lies the kingdom of Hamelin. The land is rich in beauty, but beneath the surface, a legacy of blood, corruption, and betrayal stains the earth. A group known only as the Rats of Hamelin seeks to rid the land of such filth. Enter Isabelle, who wakes up in the kingdom with no idea of how she got there or any clue as to who she is besides her first name. She meets the Rats and must decide whether to trust them... or die.