So this is an Undertale story. Just so you know. You are the human that fell into the underground. Learning how this whole world worked, learning resets and much more, you have decided to give the monsters a happy ending. After choosing pacifist, becoming friends with everyone, you got to take all the monsters to the surface, once and for all. You promised no more resets. But now, a new journey awaits you on the surface with your monster friends.