In 1946 immediately after the war, the 1st National Sports Festival was held in the Keihanshin area. As for rugby, Monji Railway Bureau (general class), Ritsumeikan College (college class), and Kobe Daini Junior High School (junior-high school class) became the champions, respectively. This festival began to take the current form as inter-prefectural games from the 3rd festival, while being held every year based on adult and school student athletes.
In 1946, the east-west inter-university tournament was held. This tournament ended with the 63rd tournament in 2008.
These three-regional tournaments were the highest level domestic rugby tournament after the war, where the rugby football union representative teams met from each of Kanto, Kansai, and Kyushu areas.
　
The Regional Inter-University Rugby Football Tournament began again in 1950 as the New-System University Tournament. This tournament has been held in the Nagoya Mizuho Rugby Stadium every year, except in 1989 and 1990 when it was held in Kourogi Athletic Park in Nisshin, Aichi. The tournament held in 2017 marked its 68th tournament, building up its history of Japanese rugby as the gateway to success for emerging universities.