Sankei, a Japanese e-commerce company, has reported a significant data breach affecting approximately 292,707 customers' personal information and 71,943 customers' credit card details. The breach was attributed to a vulnerability in its former website. Additionally, Saizeriya, a restaurant chain, is facing a separate incident involving a cyber attack that led to the potential leak of over 60,000 personal records, including information about employees and business partners. Following these incidents, Saizeriya's stock price has declined, reflecting investor concerns over the impact of the data breach on the company's operations.