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Summary
1 year after the events of Undertale, triggering the 'King Mettaton - Neutral Ending', another human falls into the depths of the Underground after a climbing incident. Sin, short for Singani, journeying through the transformed land - meeting Monsters that would later become her friends - becomes raveled in an adventure that promotes her as Mettaton's 'Rival to Fame'. The goal is to sway the love of the monsters to the rebellion's side and get Mettaton to listen to reason since becoming dictator.
Such things don't come easy, however, when you're wanted by the Robotic King and your only haven is the rebellion of monsters that have remained hidden from Mettaton. Don't worry, though...
Death is the last thing Mettaton has in mind for you.