 Nyorai kuenderera mberi kweiyi ndima - Muna 2003, Hirayama akatambira timu yenyika yeJapan U-20 mu2003 World Youth Championship aine makore gumi nemanomwe uye akarova zvibodzwa zviviri, kusanganisira mukundi wemutambo wakanangana neEjipitori kuendesa Japan kunhanho yekukanda. Muna 2004, akatamba Japan U-23 National chikwata muna 2004 Summer yeOlympic uye gore rakatevera, vakatamba ake wechipiri 2005 World Youth Championship. 