A zoo monkey in Sichuan travels to NYC to rescue his human friend from a trio of nefarious kidnappers, only to realize the Demon King is behind it all.

Staz is a vampire from the surreal "Demon World", and Fuyumi, an ordinary girl, accidentally wanders into the Demon World through a portal. Subsequently after meeting each other, Fuyumi is killed by a carnivorous plant and turned into a ghost, causing Staz to take responsibility and pledge to help bring her back to life.