[1][2][3][4][5][6] [7][8][9] Born in Takarazuka, Hyōgo Prefecture, Mihashi begun her professional career with MyNavi Sendai in Japan's Nadeshiko League in 2017 after graduating from university.
[12] Head coach Gianpiero Piovani decided to give Mihashi her Serie A debut in the first game of the season.
Piovani employed her in all 22 Serie A matches, where Mihashi scored for the first time in game week 6, in a 3–0 home win over Fiorentina.
In her second season she helped Sassuolo finish in fourth place, narrowly missing the final Champions League spot.
[13] She made her debut for the club in a 3–3 draw against Juventus on 11 September 2022[14] Mihashi announced her retirement from professional football to move into coaching at the end of the 2022–2023 season.