Discovery of a Teacher-Exclusive Voyeurism and Sexual Deepfake Sharing Community: The Current State of Deep Web Crimes Shaking the Educational Field and International Countermeasures

1. Overview of the Incident

In June 2025, two public elementary school teachers in Nagoya City were arrested for secretly filming under the skirts of female students and posting the footage in an anonymous chat group exclusive to their profession. The police announced that there were dozens of "teacher members" in the group who shared videos and photos taken within the school, as well as sexually explicit deepfakes generated from the students' facial photos.tokai-tv.comasahi.com

2. The Reality of the Community: From Secret Filming to Deepfakes

The exclusivity of being "teacher-only" and the spread of AI image generation accelerated the maliciousness. The act of synthesizing graduation album photos into nude images to create "false pornography" of real students spreads faster than traditional secret filming and is harder for victims to notice. In a 2024 survey, access to sites related to sexual deepfakes from Japan exceeded 18 million times annually, ranking third in the world.m.economictimes.com

3. Japan's Legal System and Its Limitations

In Japan, the issue is addressed by combining ① regulations against secret filming under the nuisance prevention ordinance, ② the Child Pornography Prohibition Act, and ③ the parody clause of the Copyright Act, but there is no comprehensive regulation directly targeting AI-generated content. In April 2025, the first case of enforcement occurred in an AI-generated poster sales incident (Tokyo District Public Prosecutors Office), but laws comprehensively defining deepfake crimes remain undeveloped.english.kyodonews.net

4. Trends in Overseas Regulations

4-1 United Kingdom

In January 2025, the UK government submitted an amended bill to impose a maximum two-year prison sentence for creating and sharing sexual deepfakes, which was enacted in March of the same year. Attempted crimes and threatening acts with images were also included as punishable offenses.gov.ukreuters.com

4-2 United States

At the state level, 20 states have banned non-consensual deepfakes. The federal bill "Take It Down Act" aims to make the creation, publication, and threats illegal as a unified national standard.k12dive.comsalazar.house.gov

4-3 EU and Asia

The EU explicitly mentioned non-consensual pornography as "high-risk generative AI" in the 2024 AI Act. South Korea has expanded the criminal elements to include creation, sharing, and viewing. China also imposed a watermark obligation on generated content in the 2024 "Deep Synthesis Regulation."ft.com

5. Risks in Schools and Cultural Factors

In Japanese schools, teachers have significant discretion, and smartphone management guidelines within staff rooms vary by municipality. The culture of school uniforms also tends to facilitate secret filming. Overseas, parental awareness of rights is high, and surveillance cameras and AI detection systems are increasingly being introduced into school networks. In contrast, Japan is slow to adopt such measures, citing concerns that increased surveillance could undermine trust in educational settings.

6. Responses from Platforms and AI Vendors

Major social networks block existing images using a hash filter dedicated to "Child Sexual Abuse Material (CSAM)," but AI-generated content does not match the hash. The Japan-based NPO "Hiiragi Net" uses a combination of AI detection tools and manual patrols, requesting the removal of over 10,000 items per month. However, detection is challenging for invitation-only social networks like teacher communities.tokai-tv.com

7. Technical Measures: Detection Algorithms and Watermarks

Meta and Google have embedded watermark information "SynthID" into generative AI and released detection APIs, but they can be removed with open-source tools. The UK government is considering an addendum to make the act of removing watermarks itself illegal.

8. Expert Recommendations

1. Log Management of Digital Devices in Schools──Automatic saving and auditing of shooting metadata.

2. Subsidies for Introducing Deepfake Detection AI──For local education boards.

3. One-Stop Support Desk for Victims──Integration of legal procedures and psychological care.

4. International Information Sharing──Referencing the EU/UK platform obligation model, mandating removal requests within 24 hours.
   
   
   
   

9. Impact on Victims and Society

Deepfake victimization infringes on the sexual personality rights of the individual and can lead to secondary harm such as online harassment and bullying. Particularly for children, it can have long-term effects on future employment opportunities and mental health.

10. Future Prospects

With the acceleration of generative AI making "one-click mass production" a reality, it is necessary to synchronize legal frameworks and technical responses across borders. The recent incident, involving trusted professionals like teachers as perpetrators, will likely serve as a catalyst for reconstructing digital governance in educational settings.

List of Reference Articles

• Tokai TV "Sexual Deepfakes Also Shared... 'Teacher-Only Secret Filming Community' Shocks Experts" 2025-06-28 tokai-tv.com

• Asahi Shimbun Digital English Edition "2 teachers tied to online pedophile group held over underwear shots" 2025-06-24 asahi.com

• The Independent (UK) "Teachers in Japan arrested for sharing indecent photos of girls" 2025-06-26 the-independent.com

• Economic Times "18 million people from this nation of voyeurs use AI to disrobe people virtually" 2024-12-15 m.economictimes.com

• Kyodo News "4 arrested in Japan for selling explicit AI-created posters" 2025-04-15 english.kyodonews.net

• UK Government GOV.UK "Government crackdown on explicit deepfakes" 2025-01-07 gov.uk

• Reuters "Britain to make sexually explicit deepfakes a crime" 2025-01-07 reuters.com

• NCSL "Deceptive Audio or Visual Media (Deepfakes) 2024 Legislation" 2024-11-30 ncsl.org

• Michigan Advance "Michigan lawmakers: Extortionists using AI to create deepfake pornography must be stopped" 2025-06-12 michiganadvance.com

• Reality Defender "The State of Deepfake Regulations in 2025" 2025-06-20 realitydefender.com