Privacy Day

What Is Privacy Day?

Every September 28th is "Privacy Day" (プライバシーデー, Puraibashī Dē) in Japan. On September 28, 1964, the Tokyo District Court issued a landmark ruling in the "Utage no Ato" (宴のあと, "After the Banquet") case — the first Japanese judicial decision to recognize "the right to privacy" (プライバシー権, puraibashī-ken) as a legal concept. The case involved novelist Mishima Yukio's (三島由紀夫) novel "Utage no Ato," which was based on the real life of former Foreign Minister and Tokyo gubernatorial candidate Arita Hachirō (有田八郎) — depicted without his consent in ways he found humiliating. The court's recognition that individuals have a legal right to protect their private lives from public disclosure marked the birth of privacy law in Japan.

The Mishima Case and Privacy Law

Mishima Yukio's 1960 novel "Utage no Ato" was a roman à clef — a fictionalized account of recognizable real people and events — that drew directly on the life of Arita Hachirō, depicting private aspects of his personal life in an unflattering light. Arita sued, and the Tokyo District Court's 1964 ruling agreed that the novel violated his privacy rights — ordering Mishima and his publisher to pay 800,000 yen in damages and establishing that the right not to have one's private life disclosed without good reason was a legally protected interest. Mishima appealed, but after Arita died in 1965 the case was settled with his family in 1966. The ruling was a watershed in Japanese law, drawing on constitutional principles of human dignity to recognize privacy as a fundamental right.

Privacy Law's Development

Japan's privacy law has developed significantly since the 1964 ruling. The Act on the Protection of Personal Information (個人情報の保護に関する法律, 2003, amended repeatedly since) created a comprehensive framework for the handling of personal data by businesses and government. Japan's privacy protection system has been recognized by the EU as providing an adequate level of data protection — enabling data transfers between Japan and the EU under GDPR requirements.

Privacy in the Digital Age

Digital technology has created new dimensions of privacy challenge — the collection and use of personal data by internet platforms, facial recognition systems in public spaces, and the vast data trails generated by smartphones and IoT devices. Japan's privacy law framework is evolving to address these challenges, with ongoing revisions to the Personal Information Protection Act that address cross-border data transfers, pseudonymization, and the rights of data subjects in the digital environment.

Fun Facts

• Mishima's significance: Mishima Yukio (1925-1970) is one of Japan's most internationally recognized 20th-century writers — known for works like "The Temple of the Golden Pavilion" and "The Sound of Waves" — whose spectacular political suicide (seppuku after a failed coup attempt) in 1970 made him a figure of enduring fascination and controversy.
• "Right to be forgotten": Japan has grappled with questions about the "right to be forgotten" — whether individuals have the right to have personal information removed from internet search results — in a series of court cases that have progressively clarified the application of privacy rights to search engine results.
• "This story is fiction": The disclaimer shown on Japanese TV dramas is said to have spread partly because of the privacy debate sparked by the "Utage no Ato" trial.