Dragon Quest is popular stuff! Take the DS Dragon Quest V remake , which went on sale July 17th in Japan. Square Enix announced that the game has shipped over a million copies in Japan. It's interesting to note that Dragon Quest IV also moved a million copies (rather quickly, apparently!) when it went on sale last November. So pencil in all future DQ remakes at a million copies shipped, then!
「ドラゴンクエストV 天空の花嫁」国内出荷本数100万本突破 [IT Media]