 While attending Sacred Heart School-Ateneo de Cebu, Miyagi played for the Magis Eagles his school's varsity team which he helped win various titles.He was also represented Mandaue in local inter-city tournaments as well as Central Visayas in regional meets such as the Palarong Pambansa.He decided to move to Metro Manila from Cebu after he graduated from high school to study at the University of the Philippines Diliman to take up a bachelor's degree in Physical Education.