[4] As a result, Hiraiwa was named to the Japanese team for the World Championships alongside Sasada, Teramoto, Yu Minobe, Mai Murakami, and Wakana Inoue, where she was the youngest member.

At the World Championships, Hiraiwa broke her right middle finger and metacarpal bone while training on the uneven bars and returned home to Japan for further examination and treatment; she was replaced by Azumi Ishikura.

[8] Hiraiwa began her season by competing on three events (excluding uneven bars) at the WOGA Classic in Frisco, Texas, winning the silver medal on the floor behind Canadian gymnast Shallon Olsen.

[13] Competing for Mukogawa Women's University at the All-Japan Student Championships, Hiraiwa finished fifth in the all-around and won silvers on vault, balance beam, and floor exercise.

[15] Hiraiwa struggled at the All-Japan Championships, finishing fifty-fifth in qualification and failing to advance to the final for a second year in a row.

[20] Hiraiwa credits the transfer to Toyoshima for gradually helping her overcome her mental struggles and fear stemming from her 2014 injury.

[19] After the COVID-19 pandemic limited international competitive opportunities, Hiraiwa began the season at the All-Japan Senior Championships where she surprised to win silver behind Mai Murakami and ahead of Hitomi Hatakeda.

[22] During the lead-up to the competition season, Hiraiwa experienced interruptions in her training due to the medical state of emergency induced by the COVID-19 pandemic in Japan.

[19] She opened her season at the All-Japan Championships, where she finished third in both qualifications and the all-around final to win the bronze medal behind Mai Murakami and Hitomi Hatakeda.