I don't believe you can; Kairosoft only releases games for Android, iOS, Docomo, and Softbank! devices. Where did you get impression you can get it on Windows (friend? news source?).
On Wikipedia, it states it is available on Microsoft Windows.
Ah, I forgot about that little confusion; Wikipedia isn't "wrong", but notice that the release dates show the windows release as jp (Japan) only, not ww (world wide). It's referring to:
Sorry for the confusion; Since you mentioned Windows 8 specifically, I assumed it was a new release (my bad).