Every single one of them is.
And you might not believe it, but that's one of the best parts of the game. The game puts you in a situation where you are an important cog in a huge wheel that is spinning, and by yourself, you have no power to stop it from moving, yet you are a key component on those 3 girls being involved in the competition where they might be forced to do some stuff they are not happy with (I'll mention that everything that happens is with "consent", all 3 carnations agree to participate and are free to leave at any point, the game doesn't do "rapey" stuff) but as I was mentioning, you end up spending a whole lot of time with them and as you grow closer to each of the carnations, you get to know what is at stakes for each, and not only that but you might end up falling for all 3 girls, every single one of them is an amazing character, and that whole dilemma of trying to help them through the competition, by making them have an easier time, or help them psychologically endure what they are going through, while you are also obligated to help them perform said duty that torments them is genius.
It makes you question your own morality, you have so many chances to take advantage of them, and for your character this whole thing should be only happiness and free pussy, but if you have a little bit of empathy it makes you want to root for the girls and try to help them in any way you can (while also getting some free pussy). Also I don't want to spoil anything but if seeing a character you love, end up with a sad ending worries you, I do think the game will let you help the girls that don't end up winning the exhibition in some way or another, tho take that with a grain of salt.
Aside from that, some other people already answered your first question, but yes, give the game a go, as much as it may seem this is some weird sharing game, or even NTR, it's nothing like that, you can pretty much avoid every instance where a girl has to interact with other men, and there's 2 girls that are away from the main competition and won't have to get involved in a sex club full of old men, even if some people in this thread would love it if it wasn't like that smh. Will it stay that way till the end? who knows, the game is definitely not vanilla, but that's what makes it so fun, there's no way to have a vanilla story be as interesting as the one this game has.