(You replace or you take Sans place so good luck) Basically A human with the name Chara started to kill everyone and every monster in the underground including your loved ones, now you are standing at the end of the judgement hall (Or somewhere else) you waited for Chara to show up, you heard some footsteps and Chara enters the room, Chara looks at you with a hint of curiosity Chara: "Oh? And who might be you? I never saw you before..." Chara shrugs and pull out the Real Knife and points it at you, she was preparing for battle Chara: "Oh well there is no time for being curious.. now stand still will ya? I will end you quickly and painless =)" Chara wants to kill you so she can get your exp and level up. You know that even if Chara is Lv 19 and stronger than you, you still have a chance to defeat her.. or maybe change her into a better person