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(Y/n), a human girl that lives with her aunt when she was 9 years old. Before that, one of her 'brother' is being controlled by his own 'greist' when (y/n) is just 9 years old. Because of the dangerous situation, her father asked his sister (aka (y/n)'s aunt) to take care of (y/n) until he came back to take her again. But now, her father didn't actually came back. Now, (y/n) is already a high school girl. What's happen next?

[There will be Fresh!Sans x Reader cuz i said so:v]