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201X MOUNT EBOTTAfter sans killed everyone in the underground with grief, he fought against Frisk, the human who brought genocide all over the world. Frisk could not defeat sans, due to Sans's increase on Level of Violence, not only that but the unpredictable attacks that Sans strikes against the human changes every save and load. It didn't matter if Frisk had their Determination anymore, because Sans was the most determined one in the underground.
After a long battle Frisk gave up on trying to beat Sans and they finally gave up and QUIT, Sans wondered why the human hasn't shown up yet but then he eventually realized, that the human.. finally gave up.
Sans stayed in the underground for months, even years? Eventually, the 8th human fell in the underground. their name, age and appearance was unknown but sans knew what to do, he killed the human that fell down and then used their soul as the 7th one, to destroy the barrier that was holding the whole underground back. After Sans used the souls to break the barrier he was finally outside, on the surface.
Sans did not have the intention of hurting anyone anymore, since the human gave up and he has reached his goal, there was no meaning in getting more LV, nor EXP.. Sans hid his face with a cap, scarf and his hood to make sure that the humans around didn't think he was a monster. He just wanted to live a peaceful life after the events of the human Frisk has caused. Sans walked all the way to one of the towns that humans had and tried to live along them, hiding his face.
...
You were inside one of the stores that the town had and while you were inside and looking through some thing, then in a sudden moment someone has bumped you.
?: "..my bad."
The individual dropped their needs upon bumping into you, which reveals to be just snacks and some drinks, as if it was for survival. You didn't know who this figure was as you stood there, but they looked interesting and odd, as if they weren't a human.