[UT/Undertale AU/Dust BG] Gentleman, Madman, and Dust Rain

Krist transmigrated into the body of Frisk's younger sister and fell into the Underground a month before Frisk. So far, everything was perfectly normal.

Until Frisk started killing everyone.

...Oh. So this is Dusttale.

*

Krist: I've had enough, you know, Frisk. No... Player. You kill and reset and kill and reset whenever you feel like it. Do you have any idea what we're going through in this world?! ...Ha. I have Determination too, right? I can do what Dust couldn't. Look, this is the Reset button. Smash! And look, here's a save point. Smash!

Dust: Heh. Nice work, Krist.

*

Dust: So your soul is damaged to this extent? Then why hasn't your HP changed?

Krist: Uh, how do I put this? It seems I can change my soul now... and then my body changes along with it...

Dust: For example?

Krist: For example, I can turn into a skeleton.

*

Killer: (whistling) Kristy~ What are you writing this time, some steamy little story?

Krist: Oh, it's a knm. Want to read it?

Killer: (eyes wide with shock) Huh?!

Dust: ...Killer...

* Long story. Please excuse the rough writing.

* The heroine is a good person at first, but later she's driven mad. She isn't as crazy as Dust, though: she's very clear-headed and rational in her madness.

* The heroine is human at first, then switches back and forth between being a skeleton and a human. She usually only takes human form when she's with other humans or Dust.

Theme: People fall because they lose themselves and can no longer find the pure heart they once had.