Japan Rugby League One – Division 1
Japan Rugby League One is a rugby union competition in Japan. It is the highest level of professional rugby competition in the country. Wikipedia
Broadcast partner: J Sports; DAZN; The Rugby Network
Champions: Kubota Spears Funabashi Tokyo Bay; (2022-23)
Inaugural season: 2003–04
Most titles: Saitama Wild Knights; (6 titles)
Related competition: Top Challenge League
Teams