August 2017 is the 43rd month of the PlayStation 4 being on sale in Japan. The gap grew in favor of the PlayStation 4 by 72,771 units in the last month and in favor of the PlayStation 4 by 137,528 units in the last 12 months. The PlayStation 3 currently leads by just 16,640 units.
The PlayStation 3 launched in November 2006, while the PlayStation 4 launched in February 2014. The PlayStation 4 has sold 5.22 million units, while its predecessor the PlayStation 3 sold 5.23 million units.