Asakusa Diary - The Staff Blog

Sky Bus Tokyo is the only open top sightseeing bus tour in Japan.
The tour starts from Tokyo Station and takes 50 minutes.
On the tour, you will see Imperial Palace, Supreme Court, National Diet (Parliament), and Ginza (shopping district) and Marunouchi (business district).
You will have spectacular view from the upper deck.

http://www.skybus.jp/English/index.html