'Hark! Creatures of the night do not only lurk in the shadows!'

Hushed whispers of the people tell tales of demonic sightings stretching across all of Europe, from the smallest towns to the most bustling cities. As a new mainstay of the elite order of Grand Inquisitors, Father Nathaniel Valentine is tasked by the Church to eliminate threats of the spiritual and otherwordly, along with his partner, the ever zealous and capable Penitent Bride, Sister Charlotte Halloween.

With the rapid rise of demonic possessions and the looming threat of a mysterious cult, whose goal is to bring rise to the Dark Lord himself, Father Valentine and Sister Halloween find themselves struggling against forces they have yet to understand.