Yamago was born in Saitama on January 16, 1975. After graduating from Honjo Women's High School, she joined Prima Ham FC Kunoichi (later "Iga FC Kunoichi") in 1993. In 2002, she moved to her local club Saitama Reinas FC (later "Urawa Reds"). In 2005, she moved to Women's Premier Soccer League club California Storm. End of 2005 season, she returned to Urawa Reds in September. In 2012, she moved to AS Elfen Saitama. She retired in 2014. She was selected Best Eleven 10 times (1996, 1999, 2001, 2002, 2003, 2004, 2007, 2008, 2009 and 2010).