Japan Rugby League One (Japanese: ジャパンラグビーリーグワン, romanized: Japanragubīrīguwan), formerly known as the Top League (Japanese: トップリーグ, romanized: Toppurīgu), is a rugby union competition in Japan. It is the highest level of professional rugby competition in the country. The Japan Rugby Football Union created the competition in 2003, by absorbing the Japan Company Rugby Football Championship. The chief architect of the league was Hiroaki Shukuzawa who strongly felt the urgency of improving Japanese domestic company rugby to a professional level which would allow Japan to compete more convincingly at Rugby World Cups.

Until 2022, it was an industrial league, where many players were employees of their company and the teams were all owned by major companies. While the competition was known for paying high salaries, only world-class foreign players and a small number of Japanese players played fully professionally, which meant most of the players still played in an amateur capacity. The delayed 2021 season was the final season of the Top League, with the JRFU adopting a new fully-professional three-tier system from 2022. More details about the new structure was announced to the media in January 2021. Featuring 25 teams, the 12 top-tier clubs would be split into two conferences, with seven teams competing in division two and six in division three. The new competition was formally announced as Japan Rugby League One in July 2021.

The first season in 2003–04 featured 12 teams. The league was expanded to 14 teams in 2006–07 and 16 teams in 2013–14. While Japan Rugby League One's season overlaps with the start of Super Rugby's season, the Top League played during the off-season of the Super Rugby. Therefore, many full-time foreign professionals from Southern Hemisphere countries played in the Top League, notably Tony Brown, George Gregan and Dan Carter. In the 2010s, salaries in the Top League rose to become some of the highest in the rugby world; in 2012, South Africa's Jaque Fourie, now with Kobelco Steelers, was widely reported to be the world's highest-paid player.

**Japan Rugby League One: Tournament Overview**

The Japan Rugby League One is a premier professional rugby union competition that showcases the best talent in Japanese rugby. Established to elevate the sport's profile in Japan and enhance the competitive landscape, this tournament features a dynamic mix of local and international players, bringing together teams from across the nation to compete at the highest level.

**Format and Structure**

The tournament typically consists of multiple teams divided into several divisions, with each team playing a series of matches throughout the season. The format includes a regular season followed by playoffs, culminating in a championship final that determines the league champion. The competition is designed to promote not only high-quality rugby but also fan engagement, with matches held in various iconic stadiums across Japan.

**Cultural Significance**

Japan Rugby League One is more than just a sporting event; it is a celebration of rugby culture in Japan. The tournament fosters community spirit, encourages youth participation in the sport, and promotes values such as teamwork, discipline, and respect. It also serves as a platform for showcasing Japan's rich cultural heritage, with events and activities that connect fans to the traditions and history of rugby in the country.

**International Impact**

With Japan's successful hosting of the 2019 Rugby World Cup, the Japan Rugby League One has gained international attention, attracting players and coaches from around the globe. This influx of talent not only raises the level of competition but also enhances the overall quality of rugby in Japan, contributing to the development of the sport on an international scale.

**Conclusion**

The Japan Rugby League One is a thrilling tournament that embodies the spirit of rugby, uniting players and fans in a shared passion for the game. As it continues to grow and evolve, it promises to play a pivotal role in shaping the future of rugby in Japan and beyond, making it a must-watch event for rugby enthusiasts worldwide.