Discussions of the 1945 postwar restoration of the Philippine Congress often mention an American-sequestered Japanese school on Lepanto Street (now Sergio H. Loyola Street), Sampaloc, Manila. This building witnessed the country’s transition from a commonwealth to a republic in 1946 and the passage of significant laws before the Congress returned to the rehabilitated war-devastated Legislative Building in 1949. Despite its importance, the edifice is neither marked as a historic site nor featured in Manila’s local tourism materials. The historic structure was demolished around 2006. This paper argues that the site and structure’s post-Congressional utilization and its representation in various primary and secondary accounts contributed to its obscurity. However, reconstructing its history reveals details that might help illuminate Japan’s prewar dynamics with the Philippines and explain why the U.S. sequestered it.