[6][7] Ono made his professional debut against Jun Kitagawa at SHOOT BOXING 2014 act.1 on February 23, 2014, in a lightweight rookie rules bout.
[9] Ono made his third professional appearance at SHOOT BOXING 2014 act.3 on June 21, 2014, opposite Tetsuyuki Uemura.
[13][14] Ono, whose seven victories had earned him the status of Shootboxing's top ranked lightweight contender, was then booked to face the 7–2–1 mixed martial artist Teruto Ishihara at SHOOT BOXING S-cup 65 kg World Tournament 2018 on November 30, 2014.
[19] Ono rebounded from his first professional loss with a unanimous decision victory over TASUKU at SHOOT BOXING 2015～SB 30th Anniversary～ act.1 on February 21, 2015.
[20] Ono failed to build on this success however, as he suffered a majority decision loss at the hands of Koji Ikegami at SHOOT BOXING 2015～SB 30th Anniversary～ act.2 on April 18, 2015.
[21] Ono faced the second-ranked Shootboxing lightweight conteder Yuji Sugawara at SHOOT BOXING 2015～SB 30th Anniversary～ act.3 on June 21, 2015.
[22] Ono faced the Shooto Pacific Rim Lightweight champion Taiki Tsuchiya at SHOOT BOXING 30th ANNIVERSARY "CAESAR TIME!"
[23] Ono faced the future K-1 Super Lightweight champion Rukiya Anpo at SHOOTBOXING THE LAST BOMB on October 3, 2015.
[24] Ono faced the former DEEP KICK super lightweight champion Yukimitsu Takahashi at SHOOT BOXING 2016 act.1 on February 13, 2016.
[28] Ono went overseas for the first time in his career on December 23, 2016, as he was booked to face Zhou Jiankun at Liberty War II.
Although Ono was able to nonetheless win the fight, the decision victory was immediately overturned to a no contest due to the weight miss.
[32] Ono faced the former two-weight Shootboxing world champion Hiroaki Suzuki in a -63.5 kg catchweight bout at SHOOT BOXING 2017 act.3 on September 16, 2017.
Ono was able to open a cut above Yuya's eye in the second round, but the damage done wasn't sufficient to stop the contest.
He opened a cut of Fukashi's forehead with an elbow strike in the fourth round, which forced the ringside physician to stop the fight.
[44] He made quick work of his quarterfinal opponent Cho Gyeon Jae, as he was able to twice knock him down by the 2:16 minute mark of the opening round, which resulted in an automatic technical knockout victory for him under the Shootboxing tournament rules.
[45] Ono faced Kenta Yamada in the tournament semifinals, having beaten him by majority decision a year prior.
[47] Ono faced the former REBELS Black Super Lightweight champion Yōsuke Mizouchi at KING OF KNOCK OUT 2018 on December 9, 2018.
[49] Ono faced the two-weight Lumpinee Stadium champion Pongsiri P.K.Saenchaimuaythaigym at SHOOT BOXING 2019 act.1 on February 11, 2019.
[51] Ono's five fight win-streak was snapped by Chadd Collins at SHOOT BOXING 2019 act.2 on April 27, 2019, who beat him by unanimous decision.
[52] Ono faced the former It's Showtime lightweight champion in a -69 kg catchweight bout at Shoot Boxing 2019 act.3 on June 23, 2019.
[54] Ono faced the RISE Middleweight champion in a -69 kg catchweight bout at Shoot Boxing 2019 act.4 on September 28, 2019.
[68] Ono faced the one-time K-1 super welterweight title challenger Mohan Dragon in a -68 kg catchweight bout at Shoot Boxing 2021 act.2 on April 10, 2021.
He won the fight by a third-round knockout, stopping Chuchai with a left hook to the body at the 2:21 minute mark of the round.
[77] Ono was booked to rematch BeyNoah in a 71.5 kg catchweight bout at RISE El Dorado 2022 on April 2, 2022.
[78] Kaito won the bout by first-round knockout, he landed a left hook that floored his opponent 35 seconds into the fight.
[79] Ono faced the reigning K-1 welterweight champion Masaaki Noiri in a -68.5 kg catchweight bout at The Match 2022 on June 19, 2022.
[96] Ono was expected to face Mohammed Jaraya in a -72 kg catchweight bout at RISE WORLD SERIES 2023 Final Round on December 16, 2023.
[99] Ono faced the two-weight Lumpinee Stadium and one-time ONE Featherweight Muay Thai World champion Petchmorakot Petchyindee Academy at Shoot Boxing 2024 act.1 on February 10, 2024.
[105] He won the fight by a second-round technical knockout, as Petrov was unable to continue competing due to a back injury after being swept.
[108] Ono faced Guerric Billet at SHOOT BOXING Battle Summit: Ground Zero Tokyo 2024 on December 26, 2024.