A terrifying species from another realm, known as Incubus, emerges—parasitic beings that reproduce by using humans as their hosts. Their sudden appearance pushes humanity to the brink of extinction, leaving despair and chaos in their wake. However, in humanity's darkest hour, a glimmer of hope appears: a mysterious magical girl known only as Witch, who possesses the power to hunt and destroy the Incubus. As the battle rages on, Witch's brutal methods and enigmatic past raise questions—what is the true nature of her power, and why does she seem to know so much about the Incubus? A gripping and twisted dark fantasy unfolds as humanity's survival rests on the shoulders of an unconventional heroine fighting against an otherworldly menace. Can she save the world, or will her own secrets lead to its destruction?