Congratulations to developer CyberConnect2 because the Naruto franchise of video games has never been more successful! Namco Bandai Games Japan today announced over 1.8 million copies of Naruto Storm 3 have been shipped worldwide! The game surpasses it’s predecessor and previous record holder, Naruto Storm Generations, which had over 1 million copies shipped back in July 2012.
http://www.saiyanisland.com/2014/01/naruto-storm-3-shipped-over-1-8-million-worldwide/
So it shipped 1.8 million copies but Vgchartz only has it as selling 1 million copies. It should be significantly more than that.
Not just that but it says they shipped 1 million copies of Generations by mid 2012 and as of this week Vgchartz has it at selling nearly 1.1 million copies so must be undertracked by a few hundred thousand itself.
Also Ninja Storm 2 was said to have SOLD 1.1 million copies as of May 2011, 7 months after release. Vgchartz has it at selling 1.9 million copies, that's probably undertracked aswell.