2019 World Youth Championships Competing at the 2019 World Youth Artistic Swimming Championships, held in
Šamorín,
Slovakia, when he was 15 years old, Sato placed fourth in the solo figures with a score of 70.0078 points, which was less than four-tenths of a point behind bronze medalist
Jozef Solymosy of Slovakia. He also won the bronze medal in the mixed duet event with a score of 147.8146 points, which included 76.9332 points for the free routine portion and 70.8814 points for the figures portion of the event.
2022 Artistic Swimming World Series For the
2022 FINA Artistic Swimming World Series, Sato and his partner
Tomoka Sato won the silver medal in the mixed duet free routine on the first leg of the World Series, a virtual event hosted jointly by
Canada and the
United States in March, scoring 82.7000 points for their routine choreographed in the theme "Samori". On the first day of the fourth leg of the World Series, hosted in virtual format by
Australia for the first time in May, the duo won the gold medal in the mixed duet technical routine for their performance inspired by jungle animals, which earned 83.5156 points from the judges. The following day, they won the gold medal in the mixed duet free routine with a score of 83.2667 points.
2022 World Aquatics Championships On the second day of
artistic swimming competition at the
2022 World Aquatics Championships in
Budapest,
Hungary in June, Sato and his partner Tomoka Sato ranked second in the preliminaries of the
mixed duet technical routine with a score of 85.8086 points and advanced to the final. Achieving a final mark of 86.5939 points in the final, the duo won the silver medal. Their silver medal was the highest place finish ever for Japan in the event at a
FINA World Aquatics Championships. Four days later, in the preliminaries of the
mixed duet free routine, they qualified for the final ranking second with a score of 88.9000 points. He and his sister won the silver medal in the final with a score of 89.7333 points, contributing to a new record number of 7 medals achieved by artistic swimmers representing Japan at a single FINA World Aquatics Championships. They scored within 1.3 points of gold medalists
Giorgio Minisini and
Lucrezia Ruggiero of
Italy.
2022 World Junior Championships At the
2022 World Junior Artistic Swimming Championships, held in August in
Quebec City,
Canada, Sato competed in the solo free routine on day three, scoring 83.3000 points and finishing ahead of bronze medalist Eduard Kim of
Kazakhstan to win the silver medal. Two days earlier in the Championships, he won the silver medal in the solo technical routine with a score of 80.9088 points. The Championships was the first
World Junior Artistic Swimming Championships to include male solo technical and free routines in the program. One day after the silver medal in the solo technical routine, he and Ayano Shimada won the gold medal in the mixed duet technical routine with a score of 84.0251 points, outscoring the silver medal duo from
Spain by 0.7933 points. On 26 August, day four of competition, he won a second gold medal, this time helping score 85.7000 points in the mixed duet free routine. ==International championships==