Did anyone bother to mention that those are three days worth of Mario Kart sales in Japan? It hasn't even been a week.
It is 4 days, and that is a normal first week in Japan. Why do people always make posts like this when something doesn't perform as well as they might have hoped.
Second, "Opening Week" for Mario Kart 8 sales/hw boost in Japan will be divided over two weeks. This release only covers 3 days of sales, the next 4 days of week one will be out next week.