There are more foreigners in Japan than you might think. People there are used to the idea and not interested in blonde hair at all. If they do look at you it won't be because of your hair. If you are in an area like Harajuku or Shibuya you'll find that a lot of Japanese people there have blonde hair anyway. I have dark blonde hair and have lived in Tokyo for 12 years, and believe me, no-one cares about my hair. If I do get a second look it is usually because of my height (5'9", 175cm) as I'm taller than the average Japanese woman, and people often look to see if I'm wearing high heels
