New Japan Pro-Wrestling
The promotion was founded by Antonio Inoki in 1972 after his departure from the Japan Pro Wrestling Alliance promotion. The first NJPW event took place on March 6, 1972, in Tokyo. Inoki would serve as the president of the promotion until 1989, when he stepped down to pursue a political career as a member of the Japanese House of Councillors. The promotion was a member of the National Wrestling Alliance (NWA) from 1975 to 1985 and once more from 1992 to 1993. NJPW was briefly reaffiliated with the NWA in the late 2000s to the early 2010s as well.
Wrestle Kingdom I
When New Japan Pro-Wrestling (NJPW) held the 2006 January 4 Tokyo Dome Show, Toukon Shidou Chapter 1, some saw it as a possible "end of an era". In recent years, the January 4 show, held annually since 1992, had been suffering from a drop in both interest and attendance and while the 2006 show drew 31,000 fans to the Tokyo Dome, only around 10,000 of them paid for their ticket. The show, however, was still considered a success due to high merchandise sales, allowing NJPW to keep the tradition alive for another year. NJPW had previously had success promoting interpromotional shows with All Japan Pro Wrestling (AJPW), and decided to partner with them again for the 2007 Tokyo Dome show in an effort to boost attendance numbers. The partnership was officially announced in a press conference on November 15, 2006. AJPW had recently partnered with Yuke's, the owners of NJPW, for the video game "Wrestle Kingdom". As a result, the 2007 January 4 Tokyo Dome show was dubbed "Wrestle Kingdom in Tokyo Dome". The name stuck and the annual January 4 Tokyo Dome show has been known as Wrestle Kingdom ever since.
The main event of the show was booked as a tribute to Shinya Hashimoto, who had died from cerebral hemorrhage on July 11, 2005. In the match, Hashimoto's Three Musketeers partners Keiji Mutoh and Masahiro Chono would take on Hiroyoshi Tenzan and Satoshi Kojima. Both teams had actually disbanded years earlier due to Mutoh and Kojima having jumped from NJPW to AJPW at the start of 2002, but Kojima and Tenzan had recently reunited for AJPW's 2006 Real World Tag League. Mutoh was said to have been negative towards the idea of turning the match into a Hashimoto tribute, but was convinced to go along with it on the day of the show.