Lucilsta is a nightmare world where seven vampire sisters kill each other for supremacy. The key lies in the "Magical Beast Formula," a conceptual weapon that destroys the laws of the world by materializing the distorted perceptions of its owner. Shion, the youngest and weakest of the sisters, meets a strange girl named Maroma while on a mission to steal the formula from the werewolf Count Vescaccino. Maroma calls herself a "human," but she is actually a chimera that combines elements of a zombie and Frankenstein. This mysterious encounter marks the beginning of the end of the nightmare world.