Controversies

Daiichi Kosho discloses supplier data breach potentially affecting about 8.72 million customers

Issue disclosure

Daiichi Kosho, operator of the Big Echo karaoke chain, published a statement on October 8, 2026 disclosing an incident at Nippon Columbia Group (NCG), the entertainment group that handles customer information for the firm. According to NCG, a malware infection was discovered on an employee PC between October 1 and October 2, 2026, and the device was isolated from the network on October 2; NCG reported the scope of impact to Daiichi Kosho on October 5. Daiichi Kosho said approximately 8,724,000 customers who registered or made reservations at its stores may have had their names, genders, dates of birth, email addresses and telephone numbers leaked to external parties, and that it cannot rule out the possibility of a leak. About 5.6 million of those potentially affected are Big Echo customers and 3.5 million are DK Dining customers, with Mega Big, Banana Club, Karaoke Club Dam and B-Garage also affected. NCG has reset affected passwords and is investigating the cause and whether data was compromised, while Daiichi Kosho urged customers to watch for phishing attempts and opened a toll-free helpline.