Shirou Emiya doesn't want to work overtime

This is just the story of a friend named Justice.
The story of a man named Shirou Emiya.
At a certain moment, at a certain time, a door that should not have appeared appeared in front of a man named Shirou Emiya.
He is just a half-baked magician who can only perform strengthening magic.
He is just an ordinary person who does not even have the power to save others.
He is just a friend of Justice who drowned in his own ideals.
Shirou Emiya——Who are you saving, Sakura, your drowning ideals, or yourself?