Based on an acclaimed Japanese novel, Ura-Enma, by Fumi Nakamura, an epic tale of love, sacrifice, and magic. After a swordfight, Amane, a young samurai with a haunted past, is left for dead - only to be saved by a mysterious tattooist who imbues Amane with the immortal spirit of an oni demon. From that day on, Amane ages no more. Amane learns of another with a similar oni - one that requires its host to kill - which leads Amane to the realization that the "other" is the man who murdered his sister years ago. But when his decades-long quest for the murderer causes him to cross paths with a maniacal serial killer intent on murdering the woman Amane loves, the only one who can help him is the man who killed his sister.