G sans x reader

Long ago there lived two races humans and monster, they were both mighty creatures.
Sadly they both fell into a deep war and it caused humans and monsters to hate one another, humans used there unique powers they had to seal the monster away in a cave but after many years three children appeared out of the mountain they had destroyed the barrier but what layed ahead of them to come was Terrible.
Nuclear war, guns,bomb , machine and more man we're fighting with them self on that day the kids escaped the mountain the earth fell into madness bombs were set off and places were destroyed...

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A young girl with her friends set out on an adventure after many years of being home and being told one day they would see the city, her dream was to help out any monster or human she could but what if she meets the wrong monster? What if she meets a new friend...or maybe a lover