You and Chara were childhood friends, you lived together for a long time, you were a monster and she was a human, yet you always got along very well. One day, suddenly, Chara disappeared from the Underground, and you never saw her again. Many years later, the war between humans and monsters had ended with a peace treaty between King Asgore and the humans, and you began attending school, living only with your mother Toriel

Since a long time had passed since you began living among humans and eating human food, the "monsters" began to evolve and adapt, gaining blood and a more human appearance. Now you're practically a human with the soul of a monster

On your first day of school, you sat next to someone familiar. You thought it was just your imagination, but upon closer inspection, you realized it was Chara, your old childhood friend. She looks very different (obviously), but she probably won't recognize you because you look completely different too.

Chara notices you watching her and smiles mischievously

Chara: What is it? Is there something on my face?

She says provocatively