In September 2012, Masuya was selected the Japan U-17 national team for 2012 U-17 World Cup. On September 13, 2014, when she was 18 years old, she debuted for the Japan national team against Ghana. She played for Japan at 2014 Asian Games. She played 6 games and scored 2 goals. Japan won the 2nd place. In 2018, she played at 2018 Asian Cup and Japan won the championship. She played 27 games and scored 6 goals for Japan until 2018.