In Hiro's world, youkai are a supernatural story used to scare children into obedience, and to keep men out of back alleys and brothels. Until Sakurai Hideyoshi walks through his door with a fantastical tale of a samurai who had killed a thousand men and drank the blood of his enemies, a man that lived in darkness but sought beauty to keep it at bay.

A story both terrifying and romantic...and completely ridiculous.

Unless it is true.

Convinced something softer lurks behind Hideyoshi's hard mask, Hiro follows him home. And discovers the story is real.

Only instead of the blood of his enemies, it is innocent blood taken.

Hideyoshi tells him never to return. Yet after Hiro's mother is mortally wounded, Hiro runs back to the one being he knows with the power to save her. When Hideyoshi can't, Hiro begs him for the next best thing: the power to avenge her.

As Hiro becomes youkai, he faces a new threat, something darker, older, and far more dangerous. With Hideyoshi at his side, Hiro must decide what he's willing to sacrifice--and what he's willing to do--to protect this new life before he loses everything for a second time.