Did The Dragon Quest X Announcement Cause Stock Drops?

In the realm of "man, I really don't understand financial stuff," here comes this bizarre story. Normally you would expect a new game announcement in a popular franchise to positively affect a company's stock, but apparently that was not the case with yesterday's Dragon Quest X announcement.

Japanese news site Nikkei (via Andriasang) reports that both Square Enix and Sony stock are down following the DQ X announcement. According to Rakuten Investment Management, Sony investors are concerned about the company losing business because of the popular series appearing exclusively on the Wii and Wii U. Timed alongside struggles with Sony's television division and a general slow economic season, the publisher's stock is currently at its lowest point of the year.

So why would Square Enix's stock drop as well? Good question. The Dragon Quest X publisher's stock is down over 10 percent following the announcement. My personal speculation is that investors are skeptical of Square attempting to do another MMO following its well-documented failure with Final Fantasy XIV, but as I already noted, I don't understand this financial stuff at all.