Career
Early years
Shiraiwa began skating in 2006. She competed at the 2014-2015 Japan Junior Championships but did not qualify for the free skate, having ranked 27th in the short program 2015-2016 season
Shiraiwa debuted on the International Skating Union Junior Grand Prix (JGP) circuit during the 2015-2016 season.
At her first JGP assignment, in Colorado Springs, Colorado, she placed fifth in the short program and first in the free skate, winning the gold medal by a margin of 8.06 points ahead of silver medalist Marin Honda.
Ranked third in the short and first in the free, she outscored Russia"s Alisa Fedichkina by 0.42 for gold at the JGP in Logroño, Spain. Shiraiwa"s results qualified her for the JGP Final in Barcelona.
A month later, at the JGP Final, Shiraiwa finished 5th.