01 - Who am I?

Have you ever felt like your life is turned upside down? From 100 straight to 0?
.
.
.
Well, I have.

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Celandine is a little girl living in a small village. Though she only lives in a small modest house, she is happy. She is blessed with a good and caring family.

But her world suddenly changed at her 15th birthday.

I'm not their biological child??

Then who am I?