It's been two years since the barrier was shattered... All was well until humanity's opinion and voices ruined it all. The war had begun. --------------- Although one girl had always seen the world as a sickening place... A majority of humanity was indeed contaminated, but she was one of the individuals who deserved the mercy of the monsters. From being abused and previously bullied (Y/N) had enough. She escaped her own home, only to be exposed into the havoc of the world. It made her sick. Highest rank: #16 in Fanfiction

After the monsters are set free, they aren't too keen on befriending humanity. They won't show themselves yet. They will get revenge on the war the humans had waged years ago. Now they attack in secret, getting patrols and assassins prepared at nightfall. One of the pairs of assassins is Gaster!Sans and his brother. When they find a girl who is pretty, kind, and peaceful, maybe they will have a change of heart after all. (Gaster!Sans X Reader)

Hey I'm Y/N and well I just escaped my insane abusive father. I packed my things and left. It was night when I left (same plot right?) and unfortunately I live in a not so friendly town in Maine and these guys tried to pick me up. I guess it was fate to be there 'cause this strange looking figure helped me out. Well it back fired and he took me captive instead.... Just wonderful right? Well instead of hurting me he actually helped me out and gave me a second chance at life. Ya turns out the strange figure was in fact a skeleton named Gaster Sans. Welp now I live with him and his brothers.... Let's see how this plays out shall we?