Yukio is the son of former judoka and professional wrestling legend Seiji Sakaguchi and the older brother of actor Kenji Sakaguchi, who notably co-starred in Ikebukuro West Gate Park when the television show made its debut run in 2000 and most recently in 2012 started making regular appearances on the show Saigo Kara Nibanme no Koi, he also co-starred in the film Face.

[7] After positive reviews on Yukio's performance he was later chosen to play a small supporting role in the sequel to Ninja Assassin, set to be released in 2014, but never materialized after the project was put into development hell.

[10] On August 18, Sakaguchi took part in DDT's fifteenth anniversary event in Nippon Budokan, where he and Takao won a five-team gauntlet match.

[18] On March 20, Sakaguchi took part in the annual Right to Challenge Anytime, Anywhere Contract Battle Royal, winning the match by scoring the last elimination over Masa Takanashi and earning a shot at DDT's top title, the KO-D Openweight Championship.

[25] Post-match Sato, the de facto leader of the tag team, had mentioned that he wanted to start defending the title against younger wrestlers,[26] and later nominated rookies Akito and Konosuke Takeshita as their next challengers.

[30] The rivalry culminated in an eight-man tag team match on August 17, during the first day of the Peter Pan weekend in Ryōgoku Kokugikan, where Sakaguchi, Akito, Kazuki Hirata and Masa Takanashi faced Monster Army members Antonio Honda, Daisuke Sasaki, Hoshitango and Yuji Hino.

[39] Shuten-dōji, however, regained the title from Happy Motel just seven days later in a three-way match, which also included Team Drift (Keisuke Ishii, Shigehiro Irie and Soma Takao).

[48] On December 11, 2016, Sakaguchi, Kudo and Takanashi defeated Damnation (Daisuke Sasaki, Mad Paulie and Tetsuya Endo) to win the KO-D 6-Man Tag Team Championship for the fifth time.

[50] On January 22, Sakaguchi, Kudo and Takanashi lost the KO-D 6-Man Tag Team Championship to Kazusada Higuchi, Kouki Iwasaki and Mizuki Watase in a three-way match, also involving Antonio Honda, Konosuke Takeshita and Trans-Am★Hiroshi.

[52] On June 25, Sakaguchi, Kudo and Takanashi won the KO-D 6-Man Tag Team Championship for a record-tying sixth time by defeating NωA (Makoto Oishi, Mao and Shunma Katsumata).