After the story of Undertale, all the humans were given a second chance at life, but the war happened again, now you and all the other humans had been living in the underground amongst the monsters

(This also had Undertale yellow characters)

Toriel : The pie is done!

Sans : Nice.

Papyrus : That's great! Nyeh heh heh!

Undyne : Nice, is there enough for everyone?

Toriel : Yes, I made enough for everyone!

Alphys : Well, thank you Toriel!

Toriel : No problem

Starlo : Us included?

Martlet : Yeah, we're here too!

Toriel : Of course

Ceroba : Thanks... What was your name again?

Toriel : Oh, me? My name is Toriel

Ceroba : Ah, thanks then, Toriel

Mooch : Man, I'm hungry...

Moray : Patience, Mooch!

Ace : I'm agreeing with Moray here

Ed : I'm hungry too!

Starlo : facepalms

Frisk : just watching

The other humans : Chilling