Osaka is a city in the Kansai region of Japan's main island of Honshu, a designated city under the Local Autonomy Law, the capital city of Osaka Prefecture and also the largest part of the Keihanshin metropolis, which comprises three major cities of Japan: Kyoto, Osaka and Kobe. Located at the mouth of the Yodo River on Osaka Bay, Osaka is Japan's third largest city by population after Tokyo (special wards) and Yokohama, as well as a regional economic hub.
It's home to the headquarters of some of the most well known electronic companies in the world, such as Panasonic, Sharp, and Sanyo.
Historically the commercial center of Japan, Osaka functions as one of the command centers for the Japanese economy. The ratio between daytime and night time population is 1.41, the highest in Japan, highlighting its status as an economic center. Its nighttime population is 2.6 million, the third in the country, but in daytime the population surges to 3.7 million, second only to Tokyo (combining the special wards of Tokyo, which is not a single incorporated city, for statistical purposes; see the Tokyo article for more information on the definition and makeup of Tokyo).

National Holidays

Jan.1 New Years Day
Jan.13 Coming-of-Age Day
Feb.11 National Foundation Day
Mar.21 Vernal Equinox Day
Apr.29 Showa Day
May.3 Constitution Day
May.4 Greenery Day
May.5 Children's Day
May.6 Substitute Holidays
Jul.21 Marine Day
Sept.15 Respected-for-the-Aged Day
Sept.23 Autumnal Equinox Day
Oct.13 Health Sports Day
Nov.3 Culture Day
Nov.23 Labor Thanksgiving Day
Nov.24 Substitute Holidays
Dec.23 Emperor's Birthday