After traveling through time and becoming Yu Otosaka, she made a promise with her best friend Rinao to seize the power of the whole world and save everyone before returning. However, she broke the promise after completing the final seize.
She died on crutches in a deep alley in the slums. She did it but could never go back.
When she woke up again, she was still in a deep alley, limping without any energy. Her whole body was in tatters and she didn't know where she should go or who she was. She was sitting on the ground like a beggar.
This is where it all begins.
PS Deep Pit Series: Record your thoughts first, and update as you go.