Born in Kyoto, Kizaki attended the city's Miyazu High School before moving on to further study at Bukkyo University. While there, she competed for Japan at the Summer Universiade: she was the half marathon silver medallist at the 2005 event and won a second silver at the 2007 edition, where she set a personal best of 32:55.11 minutes in the 10,000 metres. She finished nineteenth at the 2006 World Road Running Championships, helping the Japanese team win the bronze medal in the team competition.