Although females constituted a small minority in statistical reports on juvenile delinquency in interwar Tokyo, representations of the delinquent girl exercised a powerful hold on the popular imagination.  She inhabited, and in some accounts governed, the most alluring and frightening zones of the urban landscape -- the streets, theaters, and cafés of entertainment districts such as Asakusa, and the new office buildings of the city center.  Using police and social work reports, press accounts, and popular novels and essays, this paper will consider how the demonization and celebration of female juvenile delinquents reflected changes in patterns of production and consumption and the spatial dynamics of life in Tokyo from 1918 to 1932.  In addition, by examining the ways in which authorities manipulated the categories of female juvenile delinquent and unlicensed underage prostitute, I will offer new perspectives on the regulation of sexuality and gender in “modern” Japan.