A river cannot flow upstream.
If you forcibly block its existing course, the water will spill out in all directions, flood the lowlands, carve out a new channel, and make its way inexorably to the sea.
Fate is much the same. No matter how often it is altered and rewritten, everything eventually arrives at the same destination by a different path.
(This is a story told using the setting and characters of Prince of Tennis, but that's all. This old idea was finally written down because short stories of ten thousand characters are easy to finish. If you insist on calling it fanfiction, the characters are probably very out of character. You can read it as a story unrelated to Prince of Tennis.)
Theme:
The former Akaya wasn't too bad either.
Will Akaya's past be the future chosen by Ryoma? Interesting, interesting