MTT WORLD

Once upon a time, there were two races: humans and monsters. Then one day, a robot created by a certain monster suddenly took over the world.

once upon a time?

(Sounds like an automated voice)
*Currently, we are running an indefinite human welcome campaign!
*Humans can become members of the Mettaton fan club!

MTT radio broadcasting

*Ah, welcome to the underworld, human
*I am Napstablook, the administrator of the ruins, a tourist destination here

MTT WORLD - Napstablook

*Hello human
*I'm sans the guide here
*But my brother is the king's bodyguard

Sans

*There is a robot here that says do not touch.
*Do you want to touch it?
* ♡YES NO
*Robot attacked
check
*Robot - 10 ATC 999 DEF
Looks like it's broken

M3T@L C4U#H4

*Mersonalityless Mannequin
A nondescript mannequin who seems to want to change himself.

Nondescript dance

What happened to that world after Frisk went to Mettaton's ending?