Last year, a former male student, then a 16-year-old second-year high school student, was arrested for conducting over 7.2 million cyberattacks on a company that operated Internet cafes such as the Kaikatsu Club and leaking personal information, according to an interview with investigators. The Metropolitan Police Department is investigating the cyber attack as being carried out by four people aged 12 to 18 at the time who met on social media. He is denying the charges against him during the investigation.