Keys and Viles

Not much is left is Undertale. Only two humans and two monsters remain is the black void that used to be there home. The humans had apoligized for destorying the world countless times and each time they get the same reply from the short skeleton.
"Kid its not your fault. Stop saying your sorry."
Things seemed to be normal. They had gotten used to the emptiness surrounding them. But little did they know, everything was going to change forever...