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Oita Trinita was the first professional team Kazuya Yamamura played for. He joined the Japanese club in 1998 and spent two seasons there before moving to Sanfrecce Hiroshima. Yamamura made a significant impact at Oita Trinita, helping the team gain promotion to the J1 League in his second season. He was known for his technical skills, passing ability, and eye for goal.