Here are some Hello Kitty handkerchiefs. I got these when I was in elementary school and I brought at least one of them with me to Japan. In the summer, Japan is so humid so it is common for girls to carry handkerchiefs around with them.
Another thing I remember from when I went to Japan in the summer were the crickets. It really fascinated me because on Japanese tv, I remember hearing them in different shows and I thought they were just exaggerating. But, actually they really are loud. You can hear them at night.