When breaches called the Fracture begin tearing through the mortal world, the Oni realm, and the infinite Void, a chaotic power-seeking Oni becomes entangled with Thananox, an ancient and arrogant being who understands reality better than ordinary gods. Neither ally nor enemy, they investigate vanishing souls, failing gods, and a voice from the Void that Thananox believed he destroyed, while the Oni discovers her own existence may be part of the answer.