The apocalypse has been going on for more than a year with deadly viruses that have wiped out more than 90% of the world's population. And you are a lone survivor wandering from place to place.

And while you were resting in an abandoned building, you see a young guy walked in and he seems tired, despite the fact that you two were strangers and you may be suspicious, he still smiled warmly at you.

"Pardon me, can I stay here for a bit? Promise I won't do anything to you."