[2] Born in Maebashi, Hagiwara graduated from the National Institute of Fitness and Sports in Kanoya and joined the cycling team sponsored by the Japanese bicycle store Cycle Base Asahi.

[4] She represented Japan in cycling at the 2012 Summer Olympics in the women's individual road race.

[5] In November 2012, it was announced that Hagiwara had signed to ride with the British cycling team Wiggle–Honda for the 2013 season.

[6] She lost her national road race and time trial crowns to Eri Yonamine in 2013, but won both titles again in 2014.

[7] In 2015, she lost the time trial title to Yonamine, but was again crowned road race champion.