Near-future Japan is overrun with demons, creatures of darkness and corruption. By ancient unspoken agreement, humans and these dark beings have always held themselves apart—until man’s depravity began to break the barriers down. At present, humans and demons collude to form gangs and corporations.
It is an era of chaos, but those who still choose to walk the righteous path find themselves far from powerless. The government has formed the Taimanin, a group of ninjas who, while human, possess the strength to fight such nefarious foes.

Amid this endless battle against the forces of darkness—and against the objections of Asagi, their leader—the young Taimanin Yukikaze and her senior agent Rinko volunteer for a perilous mission to rescue Yukikaze’s missing mother…