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Hopeless and in despair, Sans never thought he could escape the resets and continues caused by FRISK that tormented his life. But, when he thinks the kid is possessed and stops FRISK once and for all he finds out … that he never really knew anything after all.

No more resets. No more saves. No more hiding. Life will never be the same for the Underground.
Souls and Science can be an unforgiving bitch.