First of all, english is my secondly language so i apologize i am not able to explain well. i was 15-17 year old in japan, i saw something ufos several times. i want to explain about them but i would like to report here about the weirdest experiences ever in my life. i think it was in fall 1990. my friends came my house to pick me up but i took a nap so i was not ready. i told them that i catch you up later. i was hurry to all the way to be there. when i was running, i realized something upper my head (distance 2m or less). it was white-growing, circle, disc shape, and not too big. i was hurry so i didn't much care about it( i thought it was weird but was not important). although during i was running, it was following me as same spot upper the head.I ran about in 300m, i felt scared so i stopped to run. then the thing was stopped as well. i totally freaked so just ran and never looked up after all. i don't know what it was and still wonder.