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