Japan Post Insurance rose 11.79% after media reports that it would buy back $2.9 billion of its own shares from its parent Japan Post Holdings, whose shares rose 4.12%.
Broadly on the economic recovery front, analysts say activity and spending data released on Tuesday suggest that China's economy continued to accelerate across all fronts.
Market expectations are growing that the Fed will further ease monetary policy by expanding its bond buying programme, as US lawmakers struggle to agree on a fiscal stimulus package.
Investors are also concerned that Beijing could start tightening monetary policies amid a robust economic recovery and surging commodity prices, though analysts do not see any major policy reversals any time soon.