Shimokozuru was born in Nagaokakyo on June 7, 1982. In 1999, she joined Matsushita Electric Panasonic Bambina (later "Speranza FC Takatsuki") from the youth team. In 2005, she moved to Tasaki Perule FC. She was selected Best Eleven in 2005, 2006. However, in 2008, the club was disbanded due to financial strain and she retired. In May 2009, she came back at Speranza FC Takatsuki. In 2010, she moved to TEPCO Mareeze. However, the club was disbanded for Fukushima nuclear disaster in 2011. She moved to new club Vegalta Sendai and played as captain. She retired end of 2013 season.