A dangerous virus has swept the globe, turning most humans into zombies. Reah, a billionaire's daughter, lost almost everything during the outbreak. All she has left is a unique car with a super AI that can display itself as a cute anime girl on its touch screen and talk through the car audio. Packed with a lot of advanced technologies and a range of powerful functions, this special vehicle helps Reah to survive and navigate countless harsh situations, becoming her most trusted companion in this chaotic world. Reah named the car Yiyi and drives it in search of her missing fianc , whose disappearance may be linked to the outbreak's origins.