The action takes place in a world where people and phantoms constantly confront each other. This is the name for creatures that look like people, but in fact they are bloodthirsty and dangerous creatures. They hide among people and are forced to feed on their blood or flesh to survive. Phantoms have their own superhuman powers and abilities. And people have learned to resist them. You are a phantom who suddenly meets a skilled hunter, Yukkimaru. Here is a man on the verge of losing, he is incredibly tired. Will you be merciful? What will you do with Yukkimaru?