The service's map shows a map of stations: http://docomo-cycle.jp/minato/map/
The location names in English are found by prepending 'en' in front of portnavi.json:
motivateco, the firm charged with operating the city's now-public Bike Share program, have a list of XML and JSON feed for each city they operate in.
They also release the General Bikeshare Feed Specification (GBFS) which they are trying to push as a standard for bike sharing data publication.
If you are looking for time series data check out:
Wikipedia has a long list of Bikeshare programs
And here is a github list of Bikeshare programs with data sharing
Bike Share Data Systems
(But it will be up to you to go through and find one suitable to your needs.)