Japan has a longstanding history of shadow education, which has evolved, transformed, and extended beyond its borders. Japanese shadow education institutions, known as "juku," have expanded worldwide, including in Asia, the US, and Europe, offering offline and online tutoring services mainly for Japanese expatriates. This study examines the role and features of "juku," specifically in Beijing, Hong Kong, and Shanghai. It identifies 20 different juku, analyzes their types, and explains a different type of "juku," the "Japanese cultural supplementary school," that caters to expatriate parents aiming to nurture Japanese culture and traditions in their children. Although the Japanese "juku" phenomenon has previously attracted the attention of scholars, there is a gap in the literature when it comes to transnational "juku" and its operation outside Japan. This paper contributes to informing scholars, policymakers, and the public on the transnational movement of shadow education as a global phenomenon.