After retirement, in 1990, Nishino became an assistant coach for Hitachi (later "Kashiwa Reysol"). From 1991, he managed the Japan U-20 national team and Japan U-23 national team. At U-23 Japan in 1996 Summer Olympics qualifiers, Japan qualified to 1996 Summer Olympics for the first time in 28 years since 1968 Summer Olympics, where Japan won the Bronze Medal. At 1996 Olympics, although Japan won 2 matches, Japan lost in the First round. At this time, Japan beat Brazil in first game. It was known as the "Miracle of Miami" () in Japan.