A bloodthirsty mad dog desperate for a reason to live × a witch consumed by vengeance.

“My life is yours.
And your life belongs to me.”

The beginning of a dark tale in which two deeply broken souls become bound by fate.
Keigo watched helplessly as the chairman and members of the Jowa-kai—who had been like family to him—were slaughtered by a monstrous being known only as the “Dog.”
Swearing revenge, Keigo spends his days hunted by the creature, barely able to survive from one day to the next.
Then he is rescued by Natsumi Iida, a towering fixer who runs a business specializing in dangerous jobs.
At first, Keigo is repulsed by Natsumi, who seems to take genuine pleasure in violence. But as he witnesses Natsumi’s overwhelming strength—power unlike anything he possesses himself—he begins to see a glimmer of hope.
When Natsumi quietly says, “Hire me,” Keigo makes a desperate bargain:
In exchange for his own life, he asks Natsumi to help him exact his revenge...