There’s something strange happening in the streets of Tokyo. People with superhuman strength and a lust for blood are attacking others left and right — and crime fighter Ryo Saeba is on the case. Ryo, a private eye and wannabe ladies man, just lost his friend and co-worker Hideyuki to one of these possessed assailants. Premier sweeper Ryo Saeba navigates the gritty underbelly of modern-day Shinjuku, Tokyo. An exceptional marksman and hopeless playboy, private eye Ryo Saeba reluctantly forms an alliance with his late partner's sister to investigate his death.