There is one thing that Line must keep in mind if they are serious about doing business in crypto in Japan. Ie they must be able to restore public confidence in crypto currencies. Because, Japan has a bad history with crypto currencies.

For your information, Mt Gox is a crypto currency exchange based in Japan. In 2014, they were said to handle more than 70% of bitoin transactions worldwide, and in the same year they were attacked by hackers and suffered a loss of USD 470 million.