Installation requires: a copy of 7zip at 17.01 beta or better (available here) or WinRAR at least 5.40 beta 4. (WinRAR is available here)

We recommend 7zip over WinRAR, but either will work.

Open up the location of your download folder. 

Then, open the first file titled "nine_yukiiro.rar" by using 7Zip of at least version 19.00. It should look like this:

You can extract the folder titled "nine_yukiiro" to any location but the default is recommended.

Run the file named "nine_yukiiro.exe" the play the game.

Enjoy the game.