The Monster Nyx is perfectly content with her life in the realm of The Underbed. But when her human, Luna discovers her, both of their worlds are permanently disrupted. Initially horrified, Luna seeks to get rid of the monster living under her bed, but shes no match for her own curiosity. Luna begins to observe changes in herself that make it increasingly difficult to tolerate the world above. This is Lunas worst nightmare becoming a thing of nightmare and even worse, she likes it. The two of them find a twisted sense of safety in each other, but at what cost?