Someya represented Japan at the 2013 World Games held in Cali, Colombia and she won the gold medal in the women's kumite 68 kg event.

[2] At the 2017 World Games held in Wrocław, Poland, Someya won the bronze medal in the women's kumite 68 kg event.

[3][4] At the 2018 Asian Karate Championships held in Amman, Jordan, Someya won the gold medal in the women's kumite 68 kg event.

[1] At the 2019 Asian Karate Championships held in Tashkent, Uzbekistan, Someya won one of the bronze medals in the women's kumite 68 kg event.

[8][9] In 2021, Someya competed in the women's 68 kg event at the World Karate Championships held in Dubai, United Arab Emirates.