If your PC has not JAVA runtime environment, please install.
JAVA runtime environment can be downloaded from http://www.java.com/.
And then download SimYukkuri.jar. PCにJAVAランタイム環境がインスト... Show How to Install
How to start the game.When you double-click SimYukkuri.jar, the game will be running on Windows or MacOS X.If you use Linux, you have to select java by 'Open with Other Application' with right clic... Show Usage