The speed of decline caught policymakers off guard, exposing a rift between a central bank intent on stoking inflation and a government facing backlash over rising prices.
Money managers in Japan see conservative buyers like life insurers helping the country reaffirm its position as the biggest foreign holder of Treasurys after heavy selling in recent months.
Nippon says 50 billion yen of the financing facility will be invested in two renewable energy and decarbonisation fund of funds managed by Nissay Asse.