[2] Kiyomiya began training at the Pro Wrestling Noah dojo immediately after graduating from high school in March 2015[1][3] and made his debut on December 9, losing to Hitoshi Kumano at Winter Navigation.

[11] Kiyomiya would remain winless until March 17, when he teamed with Mitsuhiro Kitamiya and Hitoshi Kumano to defeat Kyu Mogami, Ayato Yoshida and Go Asakawa at a Taka and Taichi Produce show for his first professional win.

[17] Kiyomiya teamed with the ace of Pro Wrestling Noah, Naomichi Marufuji on August 24, defeating Minoru Suzuki and Takashi Sugiura.

[18] Kiyomiya wrestled again for NJPW on September 1 at Lion's Gate Project 3, representing Noah alongside Masa Kitamiya, Katsuhiko Nakajima, Maybach Taniguchi, and Go Shiozaki in a ten-man tag team match where they were defeated by NJPW's Hiroyoshi Tenzan, Satoshi Kojima, Yuji Nagata, Manabu Nakanishi and Katsuyori Shibata.

[29] Kiyomiya returned from his excursion on December 22, 2017, confronting and challenging Kenoh after he had defeated Eddie Edwards to win the GHC Heavyweight Championship.

A few weeks later on April 29, the two defeated The Aggression (Katsuhiko Nakajima and Masa Kitamiya) to win the GHC Tag Team Championship, but lost the titles back to them exactly one month later on May 29.

[31] On December 16, Kiyomiya challenged and defeated Takashi Sugiura to win the GHC Heavyweight Championship for the first time in his career, making him the youngest ever champion in the process at the age of 22.

Masa Kitamiya won a Number One Contender match against Atsushi Kotoge on January 20, but was defeated by the Heavyweight Champion on February 1.

In July, Kiyomiya and Masa Kitamiya defeated Katsuhiko Nakajima and Manabu Soya to win the GHC Tag Team Championships.

In November at Demolition stage in Yokohama, Kiyomiya and Kitamiya lost the GHC Tag Team titles to Keiji Muto and Naomichi Marufuji, ending their reign at 114 days.

Kiyomiya teamed with Daiki Inaba, defeating Masaaki Mochizuki and Naomichi Marufuji in the semi-finals, but losing to Hideki Suzuki and Takashi Sugiura in the finals.

[32] On June 12 at CyberFight Festival 2022, Kiyomiya teamed with Daisuke Harada and Yo-Hey against Stinger (Yoshinari Ogawa and Hayata) and Rob Van Dam, in a losing effort.

[36] On February 12, following another successful GHC Heavyweight Championship defence against Jack Morris, Kazuchika Okada attacked Kiyomiya, further escalating their rivalry that stems from a tag match at NJPW's Wrestle Kingdom 17.

[38] On March 19 at Noah Great Voyage in Yokohama 2023, Kiyomiya lost the GHC Heavyweight Championship to Jake Lee, ending his second reign at 175 days.

[41] On January 8, 2022 on Night 3 of Wrestle Kingdom 16, Kiyomiya made his New Japan Pro-Wrestling debut teaming with Keiji Muto in a losing effort to NJPW's, Hiroshi Tanahashi and Kazuchika Okada.

The two men continued to brawl, despite being pulled apart by their respective tag-team partners, causing the match to end in a no contest and starting a heated inter-promotional rivalry between the two World Champions.

[45] Kiyomiya participated in the 2023 World Tag League, teaming with Ryohei Oiwa in the A-Block, the duo finished with 4 points, thus failing to advance to the semi-finals.

On January 4, 2024 at Wrestle Kingdom 18, Kiyomiya teamed with Shota Umino, in a losing effort against House of Torture (Evil and Ren Narita).