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BeforeTale is an AU where Chara does the exact something they do in AfterTale except this time instead of being stuck inside the loading screen Sans is trapped outside of his Au and must ask for help from UnderFell Sans.
This Backfires when UnderFell Sans tries to quite out of helping Syno!Sans, but when he returns he comes back to find everyone in UnderFell gone. When he returns to Syno he finds out he took them. And this is where the story begins.