Before

Megan is sucked out of her timeline where she lives a happy life with a few unfortunate monsters and a small human child who want to live a peaceful life with the human race on the surface.

She wakes up in the nightmarish world of Underfell. She's captured by the skeleton brothers and held in their shed for several days. There, she makes an unlikely friend.

They both must get out alive, away from Papyrus and the malicious monsters who want nothing more than bloody revenge on the human race. One more soul is needed to break the barrier, and Frisk is no where to be found. The only soul remaining is Megan's, and she's determined to get home in order to fix this hellish nightmare.