This picture of some canned food on the shelf, which I took in a supermarket in Furano, shows how well prepared the Japanese are about things.
The pictures on the cans suggest that the content is fruitcake. The label says that the food is for storage in case of disasters. The food can be preserved for a long time, up to five years.
That means some Japanese people stock a number of cans of this food at home and have them replace every five years, just to prepare for the worst.
They take no chances and are always ready for the Black Swan, to use Nassim Nicholas Taleb's famous analogy.