Daiichikosho Co., Ltd.

A string of large-scale personal data leaks caused by unauthorized access is continuing. Book Off Group Holdings announced on the 9th that up to about 6.43 million pieces of member data were leaked as a result of unauthorized access, and Daiichikosho, which operates the karaoke chain Big Echo, also disclosed that roughly 8.72 million pieces of personal information may have been leaked. In both cases, the leaked information includes members' and customers' names, dates of birth, email addresses and phone numbers, and both companies said that as of the time of their announcements no misuse of the information by third parties had been confirmed, urging affected individuals to be wary of suspicious emails and phone calls. At Book Off, a subsidiary that manages member information was breached, while at Daiichikosho the system of an outsourcing contractor handling personal data management was hit by unauthorized access. Both companies commented, "We deeply apologize for causing our customers enormous worry and inconvenience," and are hurrying to implement measures to prevent a recurrence.