TV-MA is not quite a good enough reason to cut it. TV-Tropes itself is PG-13, this does not mean the works on it have to be such. See: Fate stay night, Any horror movie, Most Haram manga (Although, most Haram manga will be cut due to their tendency to contain Token Mini Moe as romantic interests,) any first person shooter, any particularly gore filled show, a half of all American Comedies, and roughly every Quintin Tarantino film in existence.
I'm a little concerned in that we could be cutting something with little to no confirmation of what the nature of the questionably objectionable content. While there are sex scenes for sure, we have to remember that a few pages, someone mentioned that the game takes place in two time periods, that the sex scenes take place in a "Present" time period where the characters are older, and that the characters only really showed up as kids in the flashbacks that are, supposedly, most of the game.
Since we cant actually run the game, due to Unicode errors, we cant tell what is real, and what is not (If you run windows XP, or windows 7 64 bit, there is a program called APP locale which would allow you to run it.) Google images has the potential give some results, BUT you are at serious risk of judging this work by its fan art (which simply being a visual novel is enough to damn it to mountains of perverse sexual lust inspired fan art.)
I would say, put it on quarantine (Or put a disclaimer banner) on the trope page until a working English patch comes out, and then you can re-review it.
Its not like this case needs to be closed today, it certainly can go cold until further evidence is available.
Happens to be known as Walrus Jones in other circles.