She won one of the bronze medals in the 65 kg event at the 2018 World Wrestling Championships held in Budapest, Hungary.

[1][2] At the 2017 Asian Wrestling Championships held in New Delhi, India, she won the silver medal in the 63 kg event.

[3][4] At the 2018 World U23 Wrestling Championship held in Bucharest, Romania, she won the gold medal in the 65 kg event.

[2] In 2018, Gempei also competed in the 68 kg event at the Asian Games without winning a medal; she lost her bronze medal match against Meerim Zhumanazarova of Kyrgyzstan.

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