[3] After an amateur career of over 150 fights during which he amassed 28 titles, Hanaoka was scheduled to make his professional debut on May 19, 2019, against Korean fighter An Jong-Ho at the Japan Kickboxing Innovation "Join Forces 13" event.
[7] Hanaoka saw his winning streak broken on October 29, 2020, at the NO KICK NO LIFE "New Chapter" event when he faced HIROYUKI in a three-round fight that ended in a split draw.
[10] Hanaoka suffered his first professional loss on February 24, 2021, against Shimon Yoshinari at a NO KICK NO LIFE event where he was defeated by majority decision after five rounds.
[13] Hanaoka was next booked to face the former Lumpinee Stadium champion Visanlek Meibukai at NO KICK NO LIFE Shin Shou Yuigadokuson on July 22, 2021.
[18] He won the fight by a first-round knockout, stopping Oinuma with a left hook to the body at the 2:24 minute mark of the opening round.
On January 9, 2022, Hanaoka faced his most notable opponent yet when matched with reigning Battle of MuayThai and WPMF World champion Issei Ishii at a NO KICK NO LIFE event.
[19] On March 13, 2022, Hanaoka took part in the Japan Kickboxing Innovation Zaimax one night open finger gloves 4-man tournament.
In the final he defeated Yu Hiramatsu by first-round knockout with a straight punch to the body to win the tournament and the 300,000 yen cash prize.
[32] Hanaoka won the fight by a flying knee stoppage midway through the opening round and faced HIROYUKI in the tournament finals, which were held on the same night.
[37] Hanaoka faced the reigning Krush Bantamweight champion Koji Ikeda in a cross-promotional bout at RISE ELDORADO 2024 on March 17, 2024.