Real World Championship

Charles Istaz was a Belgian-born German-American professional wrestler and trainer, best known by his ring name Karl Gotch. In Japan, Gotch was known as the "God of Wrestling" due to his influence in shaping the Japanese professional wrestling style. He has no relation to the earlier wrestler Frank Gotch.

New Japan Pro-Wrestling Co., Ltd. (NJPW) is a Japanese professional wrestling promotion based in Nakano, Tokyo. Founded on January 13, 1972, by Antonio Inoki, the promotion was sold to Yuke's, who later sold it to Bushiroad in 2012. TV Asahi and Amuse, Inc. own minority shares of the company. Naoki Sugabayashi has served as the promotion's Chairman since September 2013, while Takami Ohbari has served as the president of the promotion since October 2020.

Muhammad Hussain Inoki was a Japanese professional wrestler, martial artist, politician, and promoter of professional wrestling and mixed martial arts. He was best known by the ring name Antonio Inoki , a homage to fellow professional wrestler Antonino Rocca. Inoki was a twelve-time professional wrestling world champion, notably being the first IWGP Heavyweight Champion and the first Asian WWF Heavyweight Champion – a reign not officially recognized by WWE.

Tokyo, officially the Tokyo Metropolis, is the capital and most populous city of Japan. Formerly known as Edo, its metropolitan area is the most populous in the world, with an estimated 37.468 million residents as of 2018; the city proper has a population of 13.99 million people. Located at the head of Tokyo Bay, the prefecture forms part of the Kantō region on the central coast of Honshu, Japan's largest island. Tokyo serves as Japan's economic center and is the seat of both the Japanese government and the Emperor of Japan.

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.

Aloysius Martin "Lou" Thesz was an American professional wrestler. He was a three-time NWA World Heavyweight Champion and held the title for a combined total of 10 years, three months and nine days – longer than anyone else in history. Considered to be one of the last true shooters in professional wrestling and described as the "quintessential athlete... a polished warrior who could break a man in two if pushed the wrong way", Thesz is widely regarded as one of the greatest wrestlers of all time and the single greatest wrestling world champion in history, and probably the last globally accepted world champion. In Japan, Thesz was known as the 'God of Wrestling' and was called Tetsujin, which means 'Ironman', in respect for his speed, conditioning and expertise in catch wrestling. Alongside Karl Gotch and Billy Robinson, Thesz later helped train young Japanese wrestlers and mixed martial artists in catch wrestling.

Osaka is a designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the third most populous city in Japan, following Special wards of Tokyo and Yokohama. With a population of 2.7 million in the 2020 census, it is also the largest component of the Keihanshin Metropolitan Area, which is the second-largest metropolitan area in Japan and the 10th largest urban area in the world with more than 19 million inhabitants.