Hirao was born in Matsudo on December 31, 1996. She joined L.League club Urawa Reds from JFA Academy Fukushima in 2014. She played many matches as a regular goalkeeper, helping the club become the champions in the first season. However her opportunity to play decreased behind Sakiko Ikeda from 2015 season. In 2018, she moved to Albirex Niigata.
In April 2018, Hirao was selected Japan national team for 2018 Women's Asian Cup. Although she did not play in any matches, Japan won the championship after two tournaments in a row. On August 2, she debuted against Australia.[2]