Minagawa appeared in Senior competitions in the 2013 Season, she competed in the Grand Prix and World Cup Rhythmic Gymnastics Series.

On September 22–28, Minagawa competed at the 2014 World Championships in İzmir, Turkey where she qualified for the all-around finals finishing in 23rd position ahead of Canada's Patricia Bezzoubenko.

On October 17–19, Minagawa competed in Tokyo for the 2014 Aeon Cup, where she finished 10th in the All-around finals behind Ukraine's Eleonora Romanova.

In 2015, Minagawa competed at the senior international division at the Moscow Grand Prix and won the all-around silver medal.

On March 27–29, Minagawa competed at the 2015 Lisboa World Cup finishing 8th in the all-around ahead of Victoria Veinberg Filanovsky, she qualified to 3 event finals (hoop, ball, and ribbon).

On September 9–13, Minagawa (together with teammates Sakura Hayakawa and Uzume Kawasaki) competed at the 2015 World Championships in Stuttgart were Team Japan finished 6th.

[10] She then competed at the 2017 Tashkent World Cup finishing 7th in the all-around behind Katsiaryna Halkina, Minagawa qualified 2 apparatus final placing 5th in hoop and 4th in ball.

[11] Minagawa competed at the quadrennial held 2017 World Games in Wrocław, Poland from July 20–30, she qualified in 2 apparatus finals finishing 6th in hoop and 5th in ribbon.

Kaho has not been chosen to represent Japan at the Olympic Games in Tokyo, after being beaten by her two younger teammates Sumire Kita and Chisaki Oiwa.

[13] Kaho was selected to compete 2021 World Championships in Kitakyushu, Japan with ribbon : she finished in 15th place and didn't qualify to the final.