[2] The league imposes a 7.2 million yen (c. U.S. $60,600) salary limit for team managers.
It originally consisted of four teams based in the Hokuriku region: the Ishikawa Million Stars, the Niigata Albirex Baseball Club, the Shinano Grandserows, and the Toyama Thunderbirds.
In 2008 the league added two teams, Gunma Diamond Pegasus and the Fukui Miracle Elephants, and split into two divisions, Jōshin'etsu (Gunma, Shinano, and Niigata) and Hokuriku (Fukui, Ishikawa, and Toyama).
[5] That same month, it was announced that a new team, the Musashi Heat Bears, based out of Saitama Prefecture, would join the league in time for the 2015 season.
[5] In July 2014, it was announced that a second new team, the Fukushima Hopes, would also join the league for the 2015 season.