So I sat down and translated this today. Was a surprisingly short/shallow game, but neat. Just unzip the attached CommonEvents json file into the Data folder of the game and it should be good to go. Back up your original CommonEvents just in case, though.
Translated:
Basic story, H events, NTR events with the prince, Suspicion-lowering NPCs, everything pertinent to story/completion basically.
Not Translated: Menu/UI (It's minimal and default anyways), "random" NPC chatter
I MTL'd it first, but took context and changed it manually afterward so that it made actual sense and sounded like proper English. I don't know if this is the proper place to post it, though.
View attachment PrincessNightPartial.7z