Hayakari consistency ranked in the top three middle distance runners at the Japanese Athletics Championships from the late 1990s up to 2005. Over this period she set a career 800 m best of 2:07.93 minutes in Osaka, represented Japan at the 1999 IAAF World Indoor Championships in Maebashi, and ran in the short race at the World Cross Country Championships in 2002 and 2005. She made an appearance over the half marathon distance at the Kobe Women's Half Marathon and won the event in a time of 1:12:27 hours.