Osaka is a city of Japan located in the Kansai region on the island of Honshu. It is the capital city of Osaka Prefecture and has a population of over 2.7 million people. Otsu is a city located in Shiga Prefecture, Japan, and is the capital of the prefecture. It has a population of around 400, 000 people. Nagoya is a city located in Aichi Prefecture, Japan, and is the capital of the prefecture. It is the fourth-largest city in Japan with a population of over 2.3 million people.