https://headlines.yahoo.co.jp/hl?a=20190129-00000025-mnet-ent
http://www.itmedia.co.jp/business/spv/1901/29/news107_0.html
https://r.nikkei.com/article/DGXMZO40588310Y9A120C1910M00?s=0
http://news.livedoor.com/lite/article_detail_amp/15944885/
https://jp.wsj.com/articles/SB11163902675293294257404585090680185918388