If Rakuten adds Bitcoin as a form of payment on their platforms, it's going to have a huge effect. If I am not wrong, Rakuten is the 13th or 14th largest company in the world by sales, with a revenue of 6 to 7 billions per year. Besides that, Japanese people are very technology friendly, I believe Bitcoin will thrive on Rakuten and we will see the effects in the increase of adoption and price.