This is an Internet King fanfic with a bit of sadness.
Just because she is a girl, she has no right to pursue her dreams. Tennis is a luxury for her.
She envied and envied her brother for being able to talk about his dreams all the time.
She was asked to be a stepping stone so that her brother could go further and further in tennis.
She spent her future life to help these teenagers grow up, but she didn't get the understanding they deserved.
That's fine too.
It doesn't matter whether you are hated or discarded.
After her mission was accomplished, it was time to disappear.
In this case, it is better to forget each other.