Analysis of information sources in references of the Wikipedia article "Dragon Quest V" in English language version.
Dragon Quest V, the cart that sold over 1.3 million copies on the first day of release
If you imagine this sort of thing all over the country, it's hardly surprising the first production run of 1.3 million copies sold out straight away.
The "Dragon Quest" sequels grossed several hundred million dollars apiece.
The "Dragon Quest" sequels grossed several hundred million dollars apiece.