This is essentially a special side story for another book I've written. Since it has little to do with that book's main plot, I decided to publish it as a new book so it wouldn't affect your reading experience.
Still, it won't be hard to follow. This book won't include the FGO world's lore or settings, so you don't need to worry about having to read the other book first. The protagonist is an ordinary person here, too. The characters have no magic, and the Servants can't use their Noble Phantasms. At most, some people can see the Card Spirits, and that's all.
As for why I'm writing this: first, I wanted to let loose and write a Yu-Gi-Oh! side story. Second, I wrote it for Yuki Judai from GX. He's the protagonist I've felt the most sorry for, so I wanted to give him the sense that he isn't alone, and that during his hardest times, he has friends who understand him, not just his cards.
I bow to all the readers who've made it this far. Thank you for reading so patiently. Thank you, everyone! (*^▽^*)