I, Shoichi Irie, Am Shirou Emiya! ! !

In a certain Holy Grail War, Shirou, who had become a heroic spirit, won. And, made a wish. "I want to be human again." However, he lost his memory and was reincarnated as Irie Shoichi. After getting the memory of ten years later, He once again recalled the past before he became Irie Masaichi. Conception:?