[2] He was the bronze medalist in the mixed doubles at the 2021 BWF World Championships in Huelva.

Yamashita graduated from Nippon Sport Science University then joined the NTT East team.

[3] Kyohei Yamashita won the mixed doubles bronze medal at the 2021 BWF World Championships after losing in the semifinals to compatriots Yuta Watanabe and Arisa Higashino, 13–21, 8–21.

[4] His mixed doubles partner Naru Shinoya retired from the national team on 15 April 2024.

[5] Yamashita continues to play in the men's doubles with Hiroki Midorikawa in local and international tournaments.