To ensure you don't confuse a legitimate copy with a broken "free" one, here is what the real installation looks like:

Note: Pirated versions often crash at Chapter 6 (The Angelic Howl flashback). Don't risk losing 30 hours of progress.

If you're interested in playing The Eden of Grisaia, consider purchasing the game from official stores like Steam or GOG. This will not only support the developers but also ensure that you receive a safe and legitimate copy of the game.