"I thought I would recognize him immediately when I saw him again."
"But often things don't develop in the direction I "think" they should."
"When I saw him, the first thing I recognized was not me, but him."
This world contains some kind of power, and she is one of the people chosen by this power. But the emergence of this power turned her into a bird imprisoned in a birdcage. Maybe the bird was a thousand times better than her, and she became a guinea pig.
She was locked up in a research institute, and she didn't know where she was. Gradually, she was derailed from her original life and world.
The last memory she had before her derailment was given to her by a boy, and her original life ended with that boy.
Intention: When I saw him, what I recognized at first glance was not me, but him.