In the waning days of August, business leaders from Japan and South Korea gathered in Sendai to acknowledge a shared vulnerability: that falling birth rates and shrinking populations have outpaced the reach of government alone. What emerged was not a treaty or a policy mandate, but a bilateral committee — a quiet bet that the private sector, moving across borders with less friction than states, might find pathways where institutions have stalled. It is a modest beginning to one of the most consequential challenges either nation has faced, and its significance lies less in what it promises than