Megalomaniac

This idea belongs to the youtuber Camilia Cuevas, and she has the animation series of this on here channel, go check it out for the videos, may have grammar mistakes and punctuation misplacement.
Spoiler Warning: Some events/characters used in this book are important/relative events that happen in undertale.
This story is about undertale, you might not know what is happening unless you know what the main plots and character of undertale, places and events happening in the game, and some big theories that people had tried to figure out the secrets behind undertale.( e.g W.D Gaster)

Big help from manred123