Japan's Nikkei Stock Average ended Monday Asian session slightly down as the upward movement was limited by surging crude prices and signals the market might be overbought. Although exporters kept collecting gains from weaker Yen, Nikkei 225 slipped 0.14% or 13.45 points and finished at 9,633.93. Inpex Corp fell 2.5% while Nikon Corp dropped 1.7% and Olympus Corp. tumbled 3.3%. Among top gainers were Mizuho Financial and Tokyo Dome, adding 3.6% and 3.7% respectively.