nLiving in the human world as a skeleton is no easy feat for Rodolpho Edward Skelius Bones. Attending a human school his second year, Skelee and his family share time between the humans and his own Spooky World, a haven created from a contentious past caused by human discrimination and unfounded superstition. In Skelee Boy and the Demon King, due to a difficult decision Skelee makes to save his human friend, he faces the consequences in the form of a demon boy named Theophilus.

Skelee's fate is in the hands of Theo, a young demon and son of the once powerful Grand Demon, Archimedes. Out to avenge and eliminate Skelee, Theo is also in line to become the next Demon King, a designation that threatens the existence of both the human and Spooky Worlds. n