Why PS4 is struggling in Japan

Eurogamer: "The PlayStation 4 is struggling in Japan. But why?

The PS4 launched in Japan in February 2014 (four months after the UK and US) and has now sold 620,000 units there. In Japan, over the last couple of weeks, the Wii U outsold the PS4. Last week the PS4 outsold its predecessor the PlayStation 3 by only 500 units."