[4] He competed on the second night of NJPW's Wrestle Kingdom 17 from January 21, where he teamed up with Alejandro and Amakusa to defeat Master Wato, Ryusuke Taguchi and Tiger Mask.
In the Global Junior Heavyweight League, he made his first appearance at the 2018 edition, placing himself in the block B, failing to score any points after competing against Yo-Hey, Ikuto Hidaka, Hi69, Minoru Tanaka and Hayata.
[9] As for the Global Junior Heavyweight Tag League, Miyawaki made his first appearance at the 2018 edition where he teamed up with Seiya Morohashi and failed to score any points after competing against the teams of Hayata and Yo-Hey, Hajime Ohara and Hitoshi Kumano, Ikuto Hidaka and Takuya Sugawara, Hi69 and Minoru Tanaka, Ricky Marvin and El Hijo del Pantera and Daisuke Harada and Tadasuke.
[10] Next year he teamed with Morohashi again, this time scoring a total of four points after going against Kotaro Suzuki and Yoshinari Ogawa, Hayata and Yo-Hey, Chris Ridgeway and Hitoshi Kumano, Daisuke Harada and Tadasuke, Hi69 and Minoru Tanaka, and Hajime Ohara and Nosawa Rongai.
[11] He scored his best result at the 2021 edition which was held under the banner of "N Innovation U-Cup" and under a format of an eight-man tournament, where he alongside his Seiki-gun stablemates Atsushi Kotoge, Daisuke Harada and Hajime Ohara won the whole event in a single block also involving Stinger (Hayata, Yoshinari Ogawa, Seiki Yoshioka and Yuya Susumu), and Los Perros del Mal de Japón (Nosawa Rongai, Yo-Hey, Kotaro Suzuki and Ikuto Hidaka).