As you know, the first DQ title for PlayStation platforms is coming out in Japan in February, this is nearly two years after the most recend title in the main DQ series, the MMORPG, Dragon Quest X was released for WiiU.
According to wikipedia there are two versions of DQX on WiiU the original release Dragon Quest X: Mezameshi Itsutsu no Shuzoku Online and the "second release" Dragon Quest X: Nemureru Yūsha to Michibiki no Meiyū Online which came out on December 2013.
According to japanlrd rankings those games have sold 84.470 and 134.625 copies respectively, as I know next to nothing about MMO works I don't really know how you count expansions on top of the main game, so for the sake of this thread let's say that Dragon Quest X on WiiU has sold between 134k and 219k give or take.
The question is, can Dragon Quest Heroes, PS4 version only, out do those numbers?