He was summoned by the kitsune Noshiko Yukimura in 1943. Noshiko had prayed to her ancestors to send a Nogitsune to attach itself to her. Her intentions were so she could deliver justice upon the army soldiers at Camp Oak Creek for the manslaughter and the death of her great love Corporal Rhys. But because a Kitsune cannot and is not meant to be controlled, the Nogitsune tricked Noshiko and instead possessed Rhys' corpse, reanimating the clinically deceased corporal.
Angered that he'd been attemptedly controlled, to spite Noshiko, the Dark Kitsune unleashed his vengeance and chaos.
This resulted in the Nogitsune being exorcised from its host, manifesting as Rhys' corpse expelling a supernatural fly. The fly was the Nogitsune's animal motif, the insect representing the Kitsune's very being, as he could not be killed. Noshiko sealed the fly in a jar and buried the jar beneath the Nemeton outside of Beacon Hills, California. For the next seventy years, the Nogitsune laid there, imprisoned by the Nemeton's power.
The sacrificial Druid ritual undertaken by Scott McCall, Allison Argent and Stiles Stilinski gave the Nemeton enough power which released the Kitsune from its prison. Eventually, the Nogitsune possessed Stiles at some point. Stiles was vulnerable to his control because the Druid sacrifice had left a door to Stiles' mind open.