Saito appeared internationally for the first time at the Junior World Championships in Sherbrooke in 2009 and achieved 21st place in the all-around and sixth place with the relay. This placement with the relay repeated the following year at the Junior World Championships in Taipei . She made her debut in the Short Track World Cup in October 2010 in Montreal and finished 19th and 12th in the 1500 m. At the 2014 World Championships in Montreal she came in 28th place in the all-around and eighth place with the relay and at the 2015 World Championships in Moscow on fourth place with the relay. In the 2015/16 season she achieved her first podium finish in the World Cup with third place in the relay at the World Cup in Dresden . At the 2016 World Championships in Seoul , she came in 16th place in the all-around competition and seventh place in the relay. In the following season she won the World Cup over 1500 m with three top ten placements, 12th overall. At the 2017 World Championships in Rotterdam , she came in 23rd place in the all-around competition and won the bronze medal with the relay. At her first Olympic participation in February 2018 in Pyeongchang , she finished 16th in the 1000 m and sixth place with the relay. The following month she came at the World Championships in Montreal on the 20th place in the all-around and on the fifth place with the relay. In the 2018/19 season, she took third place in the relay at the World Cup in Salt Lake City .
Personal bests
500 m 44.235 sec. (installed on March 17, 2018 in Montreal)
1000 m 1: 29.020 min. (installed on November 19, 2017 in Seoul)
1500 m 2: 20.488 min. (installed on November 13, 2016 in Salt Lake City)
Japan
