In the 2100s, a new virus has emerged that has drastically evolved wildlife into deadly monsters. Humans have been left behind by the virus's explosive evolution, and they are facing extinction. The only protection humanity possesses is the government's battle scientist organization, known as the White Jokers. Alice and her younger sister Mona live in an isolated island city, where they have no hope of either fleeing or being rescued by the distant government's White Jokers. Alice is determined to protect her younger sister, but she and her handguns may stand no chance against a major attack. One day, a strange boy in a white lab coat, with a mysterious timer floating over his head, appears. Is he a White Joker, and will he be able to protect their small city?