Lundenburg—a sprawling, enigmatic city where humans and beasts coexist in uneasy shadows.
Bridging the gap between these extremes are the investigators, extraordinary individuals capable of superhuman feats, entrusted with solving the city’s most dangerous cases aided by their own guardian beasts.
Ersatz, a reluctant newcomer to this treacherous world, joins Lundenburg’s Academy of Investigation in an attempt to follow in his mother’s footsteps. However, before even officially joining the school, he is pulled into a spiral of chaos when a brutal massacre within the academy reveals a sinister plot involving the Noah’s Hand, a shadowy organization with monstrous ambitions.
Along with his sharp-tongued mentor, Ersatz must navigate a city teeming with hidden threats and morally ambiguous allies. As he uncovers secrets about the town and the true nature of the investigators, Ersatz begins to question whether the line between human and beast is as clear-cut as it seems.
In a city where survival often comes at the cost of one’s humanity, Ersatz must decide what kind of investigator—and person—he truly wants to be.
