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Kaji played in the J.League, Japan's professional football league. Established in 1992, the J.League comprises three divisions: J1 League (top tier), J2 League (second tier), and J3 League (third tier). It features clubs from across the nation, showcasing fierce competition and high-quality football. The J.League has gained recognition both domestically and internationally, contributing significantly to the growth and popularity of football in Japan.