After having a huge fight with your parents, you storm out of the house and just so happen to fall down a casum. You wake up to find yourself in a place called 'The Underground' which is filled with monsters, all of which want to attack and kill you. But after a while of wandering around through the Ruins, you meet a skeleton with a blue coat. He says that his name is Sans, and he seems nice enough. He calls you pal, and wants to help you, hiding you whenever his brother Papyrus happens to be around. After a while hanging out with this skeleton dude though, you realise that you don't particularly want to leave the Underground forever. You want to stay here with your friend Sans. Except, do you really think of him as your friend? Or do you have feelings towards him that can only be described with one word. And that word does not mean 'Level Of Violence.' That is for sure.