She won the silver medal in the women's kumite 55 kg event at the 2016 World Karate Championships held in Linz, Austria.

Kumizaki won the gold medal in the women's kumite 55 kg event at the 2014 Pan American Sports Festival held in Tlaxcala, Mexico.

[4] In 2017, at the World Games held in Wrocław, Poland, she won the gold medal in the women's kumite -55 kg event.

[6] In 2019, Kumizaki won the gold medal in the women's kumite -55 kg event at the Pan American Games held in Lima, Peru.

In November 2021, Kumizaki competed in the women's 55 kg event at the World Karate Championships held in Dubai, United Arab Emirates.