She plays flanker for the Japan women's national rugby union team.

In 2015, she had a short stint in Christchurch as part of an International Rugby Programme where she played for Canterbury University.

[2] She later captained the Japanese squad to the 2017 Rugby World Cup in Ireland.

[3][4][1] Saito scored a try for Japan in their historic clash against the Black Ferns at Eden Park ahead of the World Cup in 2022.

[6] On 28 November 2023, it was revealed that she had signed with the Chiefs Manawa for the 2024 Super Rugby Aupiki season.