This volume advances the nexus approach as a practical framework for sustainable urbanization. Building on the SUGI M-NEX project in Tokyo, it integrates multimodal data, cross-sectoral analysis, and community-based practice to address interdependencies across food, energy, and water systems. The chapters demonstrate how nexus thinking informs urban governance, resilience to shocks, farmland protection, compact-city policy, and decarbonization strategies. By reframing the nexus through boundary objects, entry points, and multi-scalar perspectives, the book offers methodological innovations and policy insights. It positions nexus thinking—particularly the policy design-led nexus approach—as both an analytical tool and a governance strategy for resilient, equitable, and sustainable futures.