There is no event with more loopholes than a school festival. Since anyone can freely enter and exit, outsiders could easily sneak in. However, the perpetrators exploiting these gaps are often insiders—individuals within the school who skillfully install hidden cameras and thoroughly understand blind spots to capture unauthorized footage. Such internal voyeurism has been increasing year by year. The videos recorded this way unexpectedly end up in our system for various reasons, creating a major issue, with each clip containing shocking and unexpected content.