I'm thinkign of moving to Tokyo, Japan, have you ever been there?
I've never been there but I would love to visit!
It seems to be a major tourist destination since the Greater Tokyo Area is the most populous metro area in the world.
In the world? Wow that's actually crazy.
extensive urban rail network (as of May 2014, the article Tokyo rail list lists 158 lines, 48 operators, 4,714.5 km of operational track and 2,210 stations [although stations recounted for each operator]) of suburban trains and subways run by a variety of operators, with buses, trams, monorails, and other modes supporting the railway lines. The above figures do not include any Shinkansen services. However, because each operator manages only its own network, the system is managed as a collection of rail networks rather than
city is defined as, "one having a population of 2 million and above".
Japan.
In Japan, it is division that has been set separately from administrative areas in order to define wide urban areas by the Statistics Bureau of the Ministry of Internal Affairs and Communications. 
The Greater Tokyo Area is the most populous metropolitan area in the world. 
- Central City (中心市)
- Those of the greater metropolitan areas are the 23 special wards in the metropolis of Tokyo and other designated cities.