[2] In 2013, when a second grade student at Gotenyama Junior High School, Itahashi finished third in the 10m platform event of the national championships.

[1] In September 2014, Itahashi won the 3m springboard event at the Japanese national championships and earned selection for the 2014 Asian Games.

[2] She advanced to the semi-finals in 6th position, but an error in a subsequent dive saw her fall to 16th place and miss out on a berth in the final.

[2] In February 2016 Itahashi secured a berth at the Rio Olympics by qualifying for the final of the 10m platform event at the 2016 FINA Diving World Cup.

[11] In 2023, at the 2022 Asian Games in Hangzhou, China, Itahashi won silver with Matsuri Arai in 10 metre synchro.