The butterfly effect triggered by Greek voters left its mark on Japan's economy last week as stocks took their sharpest drop of the year and the yen soared against the dollar amid deepening concern over the eurozone's debt crisis.

The wild ride may not end until the next Greek election on June 17, some warn.

"There is such a sense of uncertainty in the air that it is a very difficult situation" for the economy, said Tsuyoshi Ueno, a senior economist at NLI Research Institute.