 Morishima attended Urayasu High School where he took part in judo.His instructor, Shoji Abe, was friends with Mitsuharu Misawa, and managed to get Morishima a tryout with All Japan Pro Wrestling, which he passed and shortly after began training with the promotion for a career in professional wrestling.Initially, Morishima was a protegé of Misawa, but after Naomichi Marufuji joined the promotion and Misawa decided instead to focus solely on training Marufuji, Akira Taue took Morishima under his wing and trained him.