Translation:
Urban Research has announced that the official in the online store by the unauthorized access by a third party, personal information of 317,326 persons of all member there is a fear that has flowed out. The leaked information does not include credit card numbers, and no secondary damage such as unauthorized use has been confirmed at this time.
[…]
The information that is believed to have been viewed corresponds to the address, name, telephone number, email address, date of birth, gender, member ID, member stage, etc.
Read more on Yahoo! Japan
h/t, @Chum1ng0