The old Karas is dead, killed by an evil ex-Karas who now named himself Ekou. He started a series of murders against humanity by making his loyal youkai drain the body fluids from humans. Otoha, a young man who just woke from a coma, is chosen to be the new Karas. Him and his trainer, Yurine, start the fight against the evil forces of darkness that are triyng to conquer the city.