O-40 Championship

Japanese is spoken as a native language by about 128 million people, primarily Japanese people and primarily in Japan, the only country where it is the national language. Japanese belongs to the Japonic or Japanese-Ryukyuan language family. There have been many attempts to group the Japonic languages with other families such as the Ainu, Austroasiatic, Koreanic, and the now-discredited Altaic, but none of these proposals has gained widespread acceptance.

Hepburn romanization is the most widely used system of romanization for the Japanese language. Originally published in 1867 by American missionary James Curtis Hepburn as the standard in the first edition of his Japanese–English dictionary, the system is distinct from other romanization methods in its use of English orthography to phonetically transcribe sounds: for example, the syllable [ɕi] is written as shi and [tɕa] is written as cha, reflecting their spellings in English.

Professional wrestling is a form of theater that revolves around mock combat matches that are usually performed in a ring similar to the kind used in boxing. The dramatic aspects of pro wrestling may be performed both in the ring or—as in televised wrestling shows—in backstage areas of the venue, in similar form to reality television.

Japan is an island country in East Asia. It is situated in the northwest Pacific Ocean and is bordered on the west by the Sea of Japan, extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans an archipelago of 14,125 islands covering 377,975 square kilometers (145,937 sq mi); the five main islands are Hokkaido, Honshu, Shikoku, Kyushu, and Okinawa. Tokyo is the nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto.

DDT Pro-Wrestling is a Japanese professional wrestling promotion based in Shinjuku, Tokyo. Its name stands for Dramatic Dream Team, which was the promotion's official name from 1997 to 2004. Founded in March 1997 by Shintaro Muto, the promotion was eventually bought and managed by Shoichi Ichimiya until December 2005, when Sanshiro Takagi took over as the new president. In 2017, DDT was sold to CyberAgent. Takagi retained his position, while Takahiro Yamauchi took over as the new DDT director.