The is a baseball league on the islands of Shikoku and Kyūshū in Japan. Neither the Central nor the Pacific League has a team based in Shikoku.
IBLJ Inc. operates the league. IBLJ (which chose its name as an abbreviation of "Independent Baseball League of Japan"), founded by commentator and former professional baseball player Hiromichi Ishige, initially held all the rights to the teams, leadership, and players, but in 2006 established separate corporations for the teams. The company has its headquarters in Takamatsu.
Prior to December 2007, the league was known as the Shikoku Island League. On December 1, 2007, it expanded to include franchises in Kyūshū, and changed its name accordingly.
Each team has 22 players, two coaches, and one manager.
The Shikoku Island League uses designated hitters.
One technique the league uses to strengthen its ties to the locales where it plays is to have those players who come from Shikoku play for their home teams. Even if they are not regulars, they often appear as designated hitters, pinch hitters, relief pitchers, and substitutes.
The first game in the league took place on April 29, 2005. On November 10, 2005, the Kochi Fighting Dogs won the first league championship.