Since 2017, all clubs competing in both Division 1 and Division 2 of the Kansai Soccer League have been eligible to take part in the
KSL Cup. Beginning in 2023, two youth sides from the
Kansai Club Youth Soccer Federation were also granted entry into the competition. The KSL Cup is a regional football tournament showcasing clubs from across Kansai. Ordinarily, 16 teams are split into four groups of four, each playing in a round-robin format. The top two teams from each group—eight in total—progress to a knockout stage, concluding with a final. However, in certain editions, the group stage is bypassed entirely, with the tournament held as a straight knockout competition from the first round. The competition was put on hold between 2020 and 2022 due to the
COVID-19 pandemic. Upon its return in 2023, the format was expanded to include 20 teams. The 16 league sides continued to form the core of the tournament, divided into groups as usual, while the top four teams from the group stage—alongside the two best runners-up—advanced to the final stage. They were joined by two additional youth teams selected by the Kansai Club Youth Soccer Federation, making up a final eight for the knockout rounds, which also featured a third-place play-off. With the introduction of the revised structure, the tournament was rebranded as The KSL Ast Enji Cup, under the title sponsorship of Ast Enji Co., for both the 2023 and 2024 editions. == 2026 clubs ==