If there is one kind of foreign sweets that the Japanese like it is chocolate. And who says chocolate says Belgian pralines. Luxury department stores in Japan all sell Belgian chocolate. The fun part is that each has a contract with a different brand, so that you don't find the same pralines everywhere (that would be boring), but can discover new delicacies every time you enter a new department store.
Here is a list of the brands you will find in each place, sorted by neighbourhood.
Mitsukoshi Nihombashi
Godiva
Takashimaya Nihombashi
Debailleul
Godiva
Wittamer
OAZO Marunouchi
Debailleul
Maru Biru Marunouchi
Debailleul
Shin Maru Biru Marunouchi
Godiva
Daimaru Tokyo Station
Jean-Philippe Darcis
Godiva
Wittamer
Matsuzakaya Ginza
Jean-Philippe Darcis
Godiva
Matsuya Ginza
Godiva
Mitsukoshi Ginza
Godiva
Takashimaya Shinjuku
Godiva
Odakyu Shinjuku
Godiva
Wittamer
Isetan Shinjuku
Godiva
Seibu Ikebukuro
Galler
Godiva
Wittamer
Tobu Ikebukuro
Godiva
Seibu Shibuya
Godiva
Takashimaya Tamagawa
Debailleul
Note that Neuhaus and Pierre Marcolini have their own stores in Ginza and Tokyo Station. Galler also has independent shops in Nishi-Shinjuku and Yurakucho.
Leonidas has 7 independent shops in Tokyo (Ginza, Akasaka, Azabu Juban, Daikanyama, Kichijoji, Kagurazaka, Iogi).
Godiva has 59 shops in total in Tokyo (without Saitama, Chiba and Kanagawa), including in all the Atre department stores, as well as in Matsuya, Matsuzakaya, Mitsukoshi and Takashimaya in the suburbs.
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