Sei Shishido
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Sei Shishido 宍戸 聖

Associate Professor — Competition Law — Seikei University

I study antimonopoly and competition law. Every time a new technology or business model appears, competition law is forced to ask anew what it is that harms competition. Following the latest developments around digital platforms and AI through comparison of Japan, the United States, and the EU, I think about the foundational theory of competition law behind them — in particular, the relationship between economic analysis and legal judgment.

Bookshelves in my office 01 / SHELF

Name badge from the 2026 Korea-Japan Competition Law Academic Research Conference 02 / SEOUL

Even Realities G2 smart glasses and ring 03 / TOOLS

The glass facade of a university library at dusk 04 / STACKS

Recent Works

Date Title Venue
2026.09 Recent Developments in Japanese Competition Law: Through the Lens of Innovation 2026 Korea-Japan Competition Law Academic Research Conference (Korea University)
2026.08 Rules, Standards and Observability under Japan’s Mobile Software Competition Act Monash Warwick Alliance Digital Regulation Workshop (Monash University)
2026.08 Competition Policy in the Platform Era: At the Cutting Edge Yuhikaku (eds. 稲葉僚太, 大泉玄之助, 伊永大輔, 中島菜子; contributed chapters)
2026.03 Main Developments in Competition Law and Policy 2025 – Japan Kluwer Competition Law Blog
2026.02 Goals, Ideology, and the Interpretation of Competition Law Kosei Torihiki no.904 p.45
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Recent Posts

I Have Released a Dedicated Editor for Writing Footnoted Papers in Markdown

I have released Genkōdai on GitHub, an editor I built for writing academic papers that makes footnoting easier while taking care never to let AI invent sources.

Sep 29, 2026

Recent Developments in Japanese Competition Law: Through the Lens of Innovation

At the 2026 Korea-Japan Competition Law Academic Research Conference at Korea University, I presented a critical examination of Japanese competition law enforcement through the lens of innovation.

Sep 18, 2026

Rules, Standards and Observability under Japan’s Mobile Software Competition Act

At the Monash Warwick Alliance Digital Regulation Workshop, I presented on the design of ex ante regulation, drawing on seven months of Japan’s smartphone act in operation.

Aug 14, 2026
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© 2026 Sei Shishido

 

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