One

A few facts:
Edo, a small fishing village, grew to become the center of power in Japan under the Tokugawa Shogunate in the early 1600s.
Edo was renamed Tokyo after the Emperor Meiji was relocated to the city in 1869.
Today, the greater Tokyo metropolitan area is the richest on earth; it’s also the most crowded.
Tokyo city houses more than eight million people, Tokyo prefecture more than 13 million, greater Tokyo more than 38 million – or close to a third of Japan’s population.
Metropolitan Tokyo covers some 845 square miles, greater Tokyo sprawls across 5240 square miles.
On average, around 16,000 people are crowded into each of these square miles.
Despite this, nearly half of the households in metropolitan Tokyo comprise just one person; in the central city regions more people live alone than not, and by 2030 it’s estimated that the number of single-person households will surpass 18 million.
Regardless of the demographic, social and economic reasons, these seem to me to be tragic numbers.