The Promise We Made

*Before the great war between monsters and humans, two people were born at the same time...*

Kali was always a special kid, seeing that she was born to a human and a skeleton. At one, she could speak full sentences and knew sign language. But while her family was picnicking on Mt. Ebott, she tripped and tumbled down the hole, only to be found by Toriel.

She later meets Sans, a cheeky skeleton with a love for puns. They instantly become best friends. When Kali's powers appear out of nowhere, Tori tells Kali that she has to stay away from Sans, she can't stand it. But it had to be done.

What will happen when Kali and Sans see each other after 10 years?