I was trying to find out why promotion of ICO in Japan is so Successful?
And got this answer: People are exchanging their Bitcoin to other Cryptocurrencies.

In a recent survey in Japan, it was reported that 2.7% of the population (3.4 Million) had purchased Bitcoin in the past and 2% are still holding it.
https://news.bitcoin.com/survey-japanese-bitcoin/

Please let me know what do you think?