[1] Kumura made his professional debut at NJKF 2013 5th against Hiroki Matsuoka, winning the fight by unanimous decision.
[8] Making the transition from Krush to K-1, Kumura fought a no-contest due to doctor stoppage against Yuta Hayashi and lost an extra round decision against Akihiro Kaneko.
He lost the semifinal bout to the eventual tournament winner Yoshiki Takei by way of TKO, as he was knocked down twice in the first round.
[10] Kumura lost his next fight against Taito Gunji by unanimous decision, but was nonetheless given a place in the Krush Super Bantamweight tournament.
[14] Kumura was scheduled to fight Tatsuya Tsubakihara in a non-title bout at K-1 World GP 2021: Japan Bantamweight Tournament.
Kumura had a great start to the fight, as he knocked Jawsuayai with a high kick near the end of the opening round.
He knocked his opponent down twice more in the following round, first with a jab counter to a lead leg kick and then with a flurry of punches, with resulted in a stoppage victory for him under the tournament rules.
[24] Kumura faced the incumbent K-1 featherweight champion Taito Gunji in the next round of the one-day tournament.