Answer
The answer is: One. Ryoichi Maeda only played for one club throughout his career, which was Nagoya Grampus. He joined the club in 1993 and remained with them until his retirement in 2010, making over 500 appearances for the club. During his time at Nagoya Grampus, he won numerous trophies, including the J1 League title, the Emperor's Cup, and the J.League Cup.