What particular aspects are you wanting to be similar?
That said the studio have made a handful of games all of them taking place the in the same universe (though the stories themselves aren't directly connected, but you will fine some locations that are the same in multiple of the games, as well as characters and other things present in multiple of their games.
In order from oldest to newest original release (Ingame chronologicality is the same as release order), that have been translated to English already:
https://f95zone.to/threads/lady-kni...f-the-dragon-v1-07-tsukinomizu-project.88119/
https://f95zone.to/threads/lily-kni...e-crest-of-demonia-tsukinomizu-project.22576/ (yes very similar main title, but they are 2 completely different games xD)
And after this is where Naedoko Demons Ground fits in the order
https://f95zone.to/threads/forget-me-not-gemini-fort-final-tsukinomizu-project.65603/ (The one that is most different from the others, notably very little combat (like 5-6 fights total in the whole game if I remember right, and is more of a mystery solving game)
https://f95zone.to/threads/rj215006-nightmare-girls-english-translation-non-mtl.86435/
https://f95zone.to/threads/tsukinomizu-project-the-succubus-trap-island.55076/ (this one I saw a few days ago on on ULMF that the person who translated Nightmare girls are gonna do a full translation of this as well, that should be better than what is in that thread