In near-future Japan, a specialized team of shinobi undergoes final preparations to counter a long-dormant demonic incursion. For generations, humans and demons have observed strict boundaries, yet recent disturbances signal that this fragile separation is crumbling. The warriors must now confront the first signs of an encroaching threat that challenges their training and resolve. As the mission begins, the group faces the unsettling prospect of direct engagement with forces once thought distant and contained.