I'm not sure which novel you're referring to because you didn't provide a specific name or author. However, according to what I know, the protagonists of some doomsday novels usually have a common characteristic, that is, they have to work hard to survive before the end of the world and gradually adapt to this new world in the process. Some novels might describe a global disaster, such as Doomsday Foreignland or Doomsday City, while others might focus more on the protagonist's personal story, such as Doomsday Blade or Doomsday Flow. No matter what type of novel you are referring to, I hope I can provide you with useful information.