Vanitas hasn't tasted blood in sixty years — until a rain-slicked park and a hunter named Sakura change everything. She's a fire mage sworn to kill monsters like him. He's a 500-year-old vampire frozen at sixteen, with no patience for human morality. Neither expects to survive the night. Neither expects to need the other again. When ghouls start breaking the ancient limits Nature placed on them, Vanitas and Sakura are forced into an uneasy alliance — one that pulls them from Indian deserts to coral reefs, from a dragon's deal to the ruins of Babylon itself. Something is hunting the supernatural world from the shadows: an organization calling itself Black Death, harvesting ghouls to build power no human should hold. As the body count rises and Nature's patience wears thin, Vanitas and Sakura discover the line between hunter and monster was never as clean as either believed. He still drinks blood. She still hunts his kind. But somewhere between the violence and the silence after it, something neither of them has a name for has taken root. Enemies first. Something else after. The end of the world doesn't wait for either of them to figure out which.