Yokohama is Japan's second-largest city and a major port city located south of Tokyo, with a population of over 3.7 million people.

Kitakyushu is a major industrial city in southwestern Japan, located on the island of Kyushu, and is known for its steel and automotive industries.

The Kamakura period, which lasted from the 12th to the 14th century, was a time of political upheaval and marked the rise of the shogunate.