just extract and replace it with the data folder in the www (machine trans btw)
i have already tested it. It translates almost everything except these things which you can just use the google image translator to translate it
Downloading the game will also give you a note which, among other various information, says that "For those who really want to see only the erotic scenes, we will introduce how to register all memories in the ci-en article.", though I've just looked over their 6 most recent posts and couldn't see anything, soo I'm guessing it'll be coming later on.