Original breach notices not in English, so I hope this is an accurate recap of the situation from another source:
The Official Goods Online Shop for video game studio Square Enix updated on Tuesday to announce that “the possibility of unauthorized access in the Square Enix Official Merchandise online shop” occurred between September 13 and 18. Further investigation into the log-ins revealed evidence that information stored in the site’s servers was stolen. Stored information included customers names, addresses, telephone numbers, gender, birthday, and e-mail addresses. The company also stated that it is possible stored credit card information was accessed although it was not specifically stored on the breached server. The company has yet to discover proof that credit card information was stolen.
Read more on AnimeNewsNetwork.
This is not Square Enix’s first reported hack. In May 2011, they acknowledged that 350 job applicants as well as 25,000 customers had data accessed. And in December 2011, they reported that both their Japanese and North American servers had been attacked, but subsequently stated that no customer data was accessed.