A Multiverse Crossover: Starting by Creating Delta of Fate

"Shirou, you play this. Press it whenever I tell you to." Shirou Emiya sat down and began confirming selections as Kazuma Satou instructed. On his first try, he hit three identical numbers. As he kept winning, a staff member approached with a smile. "Sorry, this machine may be broken. Could I trouble you to switch to another one? Thank you." Kazuma Satou nodded and moved on to the next machine with Shirou Emiya. "Come on.