The Crystal Dome and Ichiban-gai represents a landmark urban regeneration project in Takamatsu's historic Marugame-cho shopping district. Completed in 2007, this ambitious mixed-use development integrates residential apartments, commercial facilities, social education spaces, and transportation infrastructure into a cohesive urban environment. The project's distinctive crystal dome structure serves as both an architectural focal point and functional public space, creating a vibrant hub that revitalizes the traditional shopping street. Designed collaboratively by Sakaura Architectural Institute, Yūichi Fukugawa with Town Making Company Sheep Network, and Tokihiko Takaya's office, the development successfully balances modern design principles with respect for the area's commercial heritage, establishing a model for contemporary Japanese urban renewal.