Now this takes place after a huge battle against humans and monsters.The monsters were banned to the underground but...somehow they rose back to the surface and started killing humans for vengeance.Every human they find are either killed or held hostage to make other humans come out of the shadows to save one of them but in they end they are all killed.But one human by the name of Y/N was captured to lure other humans out but no one came for her/him.She/he was about to be killed until the monsters decided she/he maybe useful.A skeleton named Sans kept an eye on her/him but the longer they stayed...the more he had grown closer to them...maybe even more than just co workers.Will Y/N become one of them and stay with the pun loving skeleton or will they use him and kill everyone?Question is...Are YOU one of them?Or against them?