Hiroaki and the gang roam the city, gathering all sorts of supplies in order to survive in their zombie-infested world. Along the way, they stumble across a wheelchair-bound girl by the name of Shiiko, and she informs them that there's a way for humanity to flourish once again. Zombie origins, humanity's salvation, and the AI known as Raven-find out how all these plot points intertwine as the happiest of happy endings creeps over the horizon!