Mikami was born in Ichihara on January 8, 1981. In 1996, she joined Nikko Securities Dream Ladies. The club also won Nadeshiko League championship for 3 years in a row (1996-1998). However, the club was disbanded in 1998 due to financial strain. She moved to Tasaki Perule FC. In 2001 season, she was selected Best Eleven. In 2002, she moved to her local club JEF United Ichihara (later "JEF United Chiba"). In 2003, she went to United States and played university team. In 2007, she returned to JEF United Chiba. In 2009, she retired.