Big Japan Pro Wrestling (2008–present) Okabayashi is a former member of the
Japan Self-Defense Forces and had a sports background in
judo and
weightlifting, Four months after his debut, Okabayashi made his
American debut, when he, along with several other BJW wrestlers, took part in the Global Gauntlet events held by the
Chikara promotion. Back in BJW, Okabayashi formed a
tag team with Daisuke Sekimoto, which led to him winning his first title on July 27, 2009, when the two defeated
Isami Kodaka and
Masashi Takeda for the
BJW Tag Team Championship. After a five-month reign, they lost the title to Shinya Ishikawa and Yoshihito Sasaki. The following April, Okabayashi returned to Chikara to represent BJW in the
2010 King of Trios tournament, where he formed a trio with Sekimoto and Kankuro Hoshino. They made it to the semifinals, before being eliminated by
Bruderschaft des Kreuzes (
Ares,
Claudio Castagnoli and Tursas). At the end of 2010,
Tokyo Sports named Okabayashi Japanese professional wrestling's
Rookie of the Year. During the year, they also won the Big Japan Tag League. During 2012, Okabayashi set his sights on the
BJW World Strong Heavyweight Championship, a new title intended for the Strong BJ division. He received his first shot at the title on June 21, but was defeated by Yoshihito Sasaki. After a four-month reign, they lost the title to Isami Kodaka and
Yuko Miyamoto in the finals of the 2012 Big Japan Tag League. Okabayashi missed most of 2014 with a left shoulder injury, which he suffered while wrestling in
Germany in January. He returned from the injury on December 21. His first big match since his return took place on February 2, 2015, when he unsuccessfully challenged
Shuji Ishikawa for the BJW World Strong Heavyweight Championship. On February 15, Okabayashi and Sekimoto won another tag team title, when they defeated
Konosuke Takeshita and
Tetsuya Endo to win the
DDT Pro-Wrestling promotion's
KO-D Tag Team Championship. On July 20, Okabayashi scored his first-ever win over Sekimoto, when he defeated him to become the new BJW World Strong Heavyweight Champion, winning the first singles title of his professional wrestling career. On August 23, Okabayashi and Sasaki lost the KO-D Tag Team Championship to
Daisuke Sasaki and
Kota Ibushi. On October 29, Okabayashi and Sekimoto defeated
Kohei Sato and Shuji Ishikawa in the finals to win the 2015 Saikyo Tag League and the BJW Tag Team Championship. They lost the title to Hideyoshi Kamitani and
Ryota Hama on December 30. On June 8, 2016, Okabayashi won another tag team title, when he and
Yasufumi Nakanoue defeated
Kazma Sakamoto and
Yuji Hino for the
Wrestle-1 Tag Team Championship. A week later, Okabayashi and Daisuke Sekimoto defeated
Bodyguard and
Zeus to win AJPW's
World Tag Team Championship. On July 24, Okabayashi lost the BJW World Strong Heavyweight Championship to Hideyoshi Kamitani in his fourth defense. On July 29, Okabayashi and Nakanoue lost the Wrestle-1 Tag Team Championship to
Jun Kasai and
Manabu Soya in their second defense. On October 31, Okabayashi and Sekimoto defeated Isami Kodaka and Yuko Miyamoto to win their second Big Japan Saikyo Tag League in a row. On November 27, Okabayashi and Sekimoto lost the AJPW World Tag Team Championship back to Bodyguard and Zeus. On December 14, Okabayashi and Sekimoto won their second Tag Team of the Year award from
Tokyo Sports. On January 2, 2017, Okabayashi and Sekimoto defeated Kohei Sato and Shuji Ishikawa to win the BJW Tag Team Championship for the third time. They lost the title to
Abdullah Kobayashi and
Ryuji Ito in their fifth defense on July 17. On August 27, Okabayashi and Sekimoto defeated
Kai and
Naoya Nomura to win the
vacant AJPW World Tag Team Championship for the second time. They relinquished the title on October 16 after Okabayashi suffered a shoulder injury. It was later announced that Okabayashi would be undergoing surgery the following December, which would sideline him for up to a year. In October 2018, BJW announced that Okabayashi would be returning from injury at
Ryōgokutan 2018. On November 11, he lost Ryuichi Kawakami in his return match. On December 9, Okabayashi and Sekimoto unsuccessfully challenged
Ryota Hama and
Yasufumi Nakanoue for the BJW Tag Team Championship. On January 13, 2019, they won the AJPW World Tag Team Championships for a third time, defeating
Shuji Ishikawa and
Suwama. They defended their titles against
Jake Lee and
Ryoji Sai on February 24 before losing the titles back to Ishikawa and Suwama on March 19. In April, Okabayashi won a tournament to determine the number one contender for the BJW World Strong Heavyweight Championship by defeating
Daichi Hashimoto in the finals on April 14. On May 5, for a second time, he defeated Sekimoto to win the BJW World Strong Heavyweight Championship. He lost the title to Kohei Sato on August 25 after two title defences. In November, he won the Zero1
Furinkazan Tag Tournament with
Yuji Hino and the BJW Saikyo Tag League with
Shigehiro Irie. On January 1, 2020, he unsuccessfully challenged Hino for the
Zero1 World Heavyweight Championship. The following day, he also unsuccessfully challenged Daichi Hashimoto for the BJW World Strong Heavyweight Championship. On January 13, he won the World Is Not Enough ~ Six Man Tag Team Tournament with Hino and Akira Hyodo. On March 3, Okabayashi and Irie unsuccessfully challenged Sekimoto and Sato for the BJW Tag Team Championship. On March 25, he won the 2AW Openweight Championship from Shu Asakawa. Also in March, Okabayashi had been entered into the
2020 Ikkitousen Strong Climb as part of the C Block; however, due to the
COVID-19 pandemic, several events scheduled to showcase the Ikkitousen Strong Climb were cancelled and all remaining matches were adjudged as draws, causing Okabayashi to miss out on the finals. On July 5, he lost the 2AW Openweight Championship to
Ayato Yoshida. On October 21, Okabayashi won his third BJW World Strong Heavyweight Championship by defeating Daichi Hashimoto. He lost the title to Yasufumi Nakanoue on January 2. ==Personal life==