March 2018 is the 50th month of the PlayStation 4 being on sale in Japan. The gap grew in favor of the PlayStation 3 by 151,045 units in the last month and in favor of the PlayStation 4 by 416,811 units in the last 12 months. The PlayStation 4 currently leads by just 414,337 units. The PlayStation 3 launched in November 2006, while the PlayStation 4 launched in February 2014. The PlayStation 4 has sold 6.55 million units, while its predecessor the PlayStation 3 sold 6.14 million units….

PS4 vs PS3 in Japan VGChartz Gap Charts March 2018 Update

Source: PS4 News – PS4 vs PS3 in Japan VGChartz Gap Charts March 2018 Update