London is a city where humans and beastmen known as cats coexist. In this world, a serial killer named Alba Rose, a cat beastman, lives a detached and violent existence. His path crosses with an orphan girl named Nico, and their meeting begins to change Alba's heart. The story follows the developing bond between the cold-blooded killer and the vulnerable orphan, exploring themes of redemption and connection against a backdrop of crime and supernatural elements.