I Became a Great Wizard After Being Abandoned by My Childhood Friend

After being abruptly abandoned by a childhood friend, I devoted myself to studying magic relentlessly.
In the process, I joined a hero’s party but was kicked out for being useless.
After that, as a result of my relentless efforts, I came to be known as a great wizard.
Now, even when I think of them, it doesn’t bother me anymore.