He returned to Japan at the age of 20 and started mixed martial arts (MMA).
He gained experience in amateur mixed martial arts while training with Kiichi Kunimoto and Kintaro at Paraestra Higashi Osaka and other venues, and made his professional debut as a professional mixed martial artist in 2022.
[2][3] Usami made his professional mixed martial arts debut on April 24, 2022, at POUND STORM.
[4] Usami also started kickboxing in December 2022, and has won five consecutive matches in four organizations: Ganryujima, KNOCKOUT, K-1, and RISE.
"[5][6][7] Usami faced Ryota Nakano at RISE WORLD SERIES 2024 OSAKA on June 15, 2024.