Actually, I was the Real One

In order to receive love from her father, Keira tried her hardest to live the life of a perfect, submissive daughter. However one day, Cosette appears claiming to be his real daughter and Kiera is executed under the assumption that she is a fake.
In the last moments of her life, Cosette whispers to Kiera, “Truthfully, you were the real one.”
Kiera, recalling those words, returns to the past. Although revenge is important, what does it matter who is fake and who is real?
Now that I have been given a life again, I will live it freely for myself!
A cute female protagonist’s coming of age romance who has never made friends.