Will was born in the city of the dead, where he was raised by three undead. Although he was nurtured with love, Will questions his existence in this life-forbidding place where he is the only human alive. He discovers his three parents are secretly hiding something that may explain this mystery, and as if this weren't puzzling enough, he has yet to discover that still more secrets lie within him.

Under the guidance of Menell, Will goes to a village that has been attacked by monsters. As he subdues the remnants of the demons, the tragedy of the village gradually becomes apparent. A house burned down by piled up corpses. And it was a boy who was burned by flames and turned into an undead (undead) who called out to Menel with a thin voice.