http://lets-business.com/money-tiger/kosaka/
https://www.google.co.jp/amp/jp.mobile.reuters.com/article/amp/
http://mw.nikkei.com/sp/#!/article/DGXLASGN21H3J_S7A120C1000000/
http://toyokeizai.net/articles/amp/155851?display=b&_event=read-body
https://www.google.co.jp/amp/jp.techcrunch.com/2017/01/27/20170124tripactions-raises-14-6-million-for-corporate-travel-booking/amp/