Undertale: Where it all began (Pacifist route)| + Reader

(Undertale is a role-playing game that uses a top-down perspective. In the game, the player controls a child and completes objectives in order to progress through the story. Players explore an underground world filled with towns and caves and are required to solve numerous puzzles on their journey.)

After years of being trapped underground, a human child fell, you stay in the Ruins for a little while, then realize there is more than just the Ruins down there. And with the determination of your soul, you choose the fate of the Underground forever.
(There will be a genocide route book)