An event to solve the mystery while walking around the city begins 
⇒October 03, 2017 From February to November 03
http://www.takarush.jp/promo/chuo2017/
Once you get a treasure map at the following distribution locations, let's start 
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Commerce and Tourism Division, 7th floor, Chuo-ku government office
Nihonbashi Special Branch Office on the 1st floor of Nihonbashi Kumin Center
Tsukishima Special Branch Office on the 1st floor of Tsukishima Kumin Center
Chuo-ku Tourist Information Center
