The Shikoku Island League is a professional baseball league in Japan, established in 2005. It consists of teams from the four prefectures of Shikoku: Kagawa, Ehime, Kochi, and Tokushima. The league serves as a platform for players to showcase their talents and potentially move up to higher leagues, such as the Nippon Professional Baseball (NPB). The league features several teams, including the Kagawa Olive Guyners and the Ehime Mandarin Pirates. Each season, teams compete for the championship title, fostering local pride and community support. The league also emphasizes the development of young players and promotes baseball culture in the region.