Hanaoka set a personal best in the long jump at the 2000 Asian Athletics Championships, clearing a national record of , and she was the bronze medallist in both the horizontal jumps at the competition. At national level she won the double at the Japanese Championships and also the long jump at the Japan National Games. She won the bronze medal in the long jump and the silver medal in the triple jump at the 2001 East Asian Games. For the second time in her career she broke a national record to win at the Japanese Championships, this time in the long jump with a mark of . She defended her national long jump title but was runner-up to Kumiko Ikeda at the National Games. The 2001 World Championships in Athletics was her first global outdoor selection, but she did not get past the long jump heats. She took a third straight jumps double at the 2002 Japanese Championships and won the National Games triple jump title as well. The 2002 Asian Games was her biggest meet that year and she came away with the long jump silver medal (behind India's Anju Bobby George) and came fifth in the triple jump.