Japan's stock which fell by about 11% one week are now up by 7%. Only 4% more and all the losses of the previous week will have been regained. Things aren't that rosy in China where the stocks have sunk further by 2%.
Unlike China with their stocks dangling by the wayside for a long time, Japan's stock trading is quite normal and on the up and up, I believe. China is experiencing the doldrums because of their problems in manufacturing, there is a shortage of factory workers amid the legion of unemployed new graduates from universities. Contrary to that, Japan has a stable economy and it will take a drastic move to roil their stock market. Those slides in Japan is just part of the trading game.