what is there to tell? one of hundreds if not thousands of Japanese arcade tokens. Very popular entertainment over there.
you buy a pocket full when you go in, spend them in the machines, leave when you are out.
you arent supposed to take them with you when you leave, but you can't redeem them, so you are stuck with any odd ones.
Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac