The Japanese currency reached its one-week high against the greenback as the risk appetite rose and the BOJ increased its assets purchase by 11 trillion yen, still embittering the markets as the amount is considered to be insufficient for bringing down the yen. The dollar stayed at 79.95 yen advancing from 79.28 yen after BOJ's easing, yet staying far below the last week's record of 80.38 yen.