Undertale Sans... Underswap Papyrus... Storyshift Chara... What could go wrong?

Dust [Dusttale Sans] kills so he can become stronger and defeat Chara. When everyone in his AU is dead. He finally faces Chara/Frisk. But instead of winning, he dies and loses. Now, what can he do except go into another AU and start the cycle all over. But how could he do this with an unfamiliar emotion constantly buzzing in his mind?

Dusttale. A Korean Undertale AU. Sans completely has lost his mind and there is no way of stopping him. Unless you kill him for the second time. At first you didn't feel regret until this particular incident happened. Chara is even intimidated and scared. Sans isn't normal, and everyone is dead. But you didn't kill them. LV 19. V.S. another LV 19.

Frisk has a very troubled past and decides to end it all, but when she survives the fall, unexpected things are yet to come. Will Chara be able to over see the things that have happened? Join us in our universe of unknown events. Help us unfold the truths that lie within our story. Frisk is female and 18 years old Chara is a female futanari and is 19 years old ((I do not own any art))