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Undertale is the story of a human goat boy called Asriel Dremurr and a goat woman called Toriel, which is his mom.

They live with humans in a village on the hills with sunlight and Asriel and Toriel were fine there. One day, humans discover something, Asriel and Toriel are not humans, they are goat humans. They think they are different so they banish them to a dark cave with no sunlight. Asriel and Toriel are worried and unsatisfied with they're new life. So they build a house on that cave with cutting off trees with an ax and starting life anew.

One day... Asriel walks around the cave, filled with only rocks..... he then finds a hidden passage on the cave that leads him outside, to the human world, to the village once again, he is then afraid to go there but he wants to feel the sunshine on him so he goes anyway... when he's on top of a hill, the humans find him and want to captured him, he then runs back to the dark cave where Toriel is, but before he can get home, he is shot by a human with an archery.... he hits the arrow on Asriel and he dies on top of a valley of yellow flower that was on the dark cave Toriel was in.

He dies there, but little did he know that those yellow flowers were magic, and whoever touches then would be turn into a talking yellow flower !

Toriel goes outside the house to see what happened and find the talking yellow flower with the other magic yellow flowers, although those other magic yellow flowers didn't have mouth to talk or eyes to see like Asriel did when he turn into a flower.

Toriel finds him in the magic yellow flower valley on the dark cave they lived in an comfort him...