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Kazuya Mitsui is a basketball player. In 2025-2026, Kazuya Mitsui played 19 games for Koshigaya Alphas (Japan D1), averaging 0.8 points, 0.3 rebounds and 0.2 assists in 4.2 minutes per game on 42.9% field-goal shooting. Scouting4U covers 5 seasons of Kazuya Mitsui's career (2020-2026), with 2 clubs.