This is “Ne-rune-rune-rune“. Everyone has eaten this snack at least once when they were childlen. This was my favorite snack when I was young. We mix the powder and a little water till the color changed completely when we eat them. There are many kinds of flavor for example pineapple taste and grape taste and soda taste. It is still sold in any supermarket. If you want to try it, you should go to the supermarket near your house.