Rubuta ci gaba don wannan sakin layi - Miyahara ya cancanci shiga gasar matasa ta duniya a kakar 2011 <unk> 2012. Ta lashe lambar azurfa a gasar farko ta Junior Grand Prix a Gdańsk, Poland, kuma ta kammala ta biyar a gasar ta biyu a Milan, Italiya. Daga nan sai Miyahara ya lashe kofin matasa na Japan kuma ya zama na shida a matakin manya
Ka yi haƙuri. Ta kasance ta huɗu a Gasar Zakarun Duniya ta farko. An gayyaci Miyahara don yin wasan motsa jiki a cikin bikin a gasar cin kofin duniya ta 2012 a matsayin zakaran zakarun kasar Japan.