Education
She also competed at the 2015 World Championships where she finished fourth on floor. The Japanese junior team finished in fourth, and Miyakawa finished seventh all-around with a 53.200. She also finished seventh in the vault and beam event finals.
Career
Miyakawa began the 2014 season at the City of Jesolo Trophy. Miyakawa was selected to compete for Japan at the 2014 Summer Youth Olympics. She finished fifth in the all-around final with a 53.300.
Downie and Miyakawa had tied for second place with 14.566.
Downie"s highest vault score was 14.866, and Miyakawa"s was 14.800. Miyakawa ended her junior career at the Élite Gym Massilia where she finished seventh with her team and twenty-eighth all-around.
Miyakawa"s senior international debut was the 2015 WOGA Classic. She finished seventh all-around at the Japanese National Championships, and she finished sixth all-around at the Nippon Hōsō Kyōkai Cup.
She was then named to the Japanese team for the 2015 World Championships along with Natsumi Sasada, Aiko Sugihara, Asuka Teramoto, Yuki Uchiyama, and Sakura Yumoto.
At the 2015 World Championships, the Japanese team finished in fifth. In the floor final, Miyakawa scored a 14.933 and tied for fourth with Shang Chunsong.