On January 5, 2023, at
New Year Dash, Michinoku, Taichi, Douki, and Kanemaru formed Just 4 Guys with the aim of reaching the top of New Japan. On February 4, at
The New Beginning in Sapporo, Taichi lost to
Will Ospreay in a singles match. On the same event, Douki and Yoshinobu Kanemaru challenged for
Catch 2/2 (
Francesco Akira and
TJP) for the
IWGP Junior Heavyweight Tag Team Championship, but lost. In March, Sanada, then a member of
Los Ingobernables de Japon, entered the
New Japan Cup. After he defeated LIJ stablemate and leader
Tetsuya Naito in the quarter-finals, he left Los Ingobernables de Japón and joined the stable, changing the name to Just 5 Guys. Sanada defeated
David Finlay in the finals of the tournament and, one month later, defeated
Kazuchika Okada for the
IWGP World Heavyweight Championship at
Sakura Genesis. Following Sanada winning the title, he was confronted by former stablemate Hiromu Takahashi, who sought a shot at the world title. Sanada accepted, however only on the basis that Kanemaru was granted a title shot at Takahashi's
IWGP Junior Heavyweight Championship, which Takahashi accepted. On April 27, Kanemaru lost to Takahashi. Two days later, at Wrestling Satsuma no Kuni, Taichi defeated Takagi to win the
KOPW championship. Following Takahashi retaining the title against Kanemaru, he faced Sanada at
Wrestling Dontaku, where Sanada retained the World title. Following the match, Sanada and the remainder of Just 5 Guys were attacked by the returning and new member of LIJ
Yota Tsuji, who challenged Sanada for his title. The day after at the event, Sanada retained his title against Tsuji. Through NJPW's partnership with
All Elite Wrestling (AEW), Douki made his AEW debut on the June 23 episode of
AEW Rampage, losing to
"Jungle Boy" Jack Perry. Sanada made his third title defense two days later at
Forbidden Door, defeating Perry. On September 24, at
Destruction in Kobe, Kanemaru betrayed the stable and joined
House of Torture. On October 1, Sanada revealed that a new member will be added at
Destruction in Ryogoku to maintain the stable’s current name instead reverting themselves back to Just 4 Guys. On October 9,
Yuya Uemura was revealed as the newest member of Just 5 Guys, teaming with Taichi and Douki to beat
Sho,
Yujiro Takahashi and Kanemaru. At
Wrestle Kingdom 18 Sanada lost his
IWGP World Heavyweight Championship to
G1 Climax 33 winner
Tetsuya Naito At
Power Struggle Sanada turned on Taichi by helping
David Finlay retain his
IWGP Global Heavyweight Championship and left the stable to join
Bullet Club's War Dogs faction, reverting the group back to Just 4 Guys. At
Dominion 6.15 in Osaka-jo Hall, Douki left the group to join
House of Torture, and Taichi won the
IWGP Tag Team Championship with non-J4G partner
Tomohiro Ishii. At a press conference afterward, Taichi and Uemura confirmed they were moving to NJPW's main unit, thereby disbanding the group. ==Members==