Several things about this game. I was initially really reluctant to give it a go for several reasons.
1. I tend to hate sandbox games in the porn genre. Usually it comes down to doing the same things again and again AND/OR skipping forward days or weeks until you finally get the right combination of daytime and place to trigger a new event.
2. While I liked the previous game, the prequel as it is, it definitely had flaws, not the least of it the aforementioned boring waiting/grinding and I honestly feared that they might continue into this one.
3. Even if the game wouldn't suffer from the two points above, the main problem would still be there, that you need content to make a sandbox game more than a chore. I mean, with a straight VN, I play the update and that's it, but in a sandbox game, I have to FIND the new content and manage to trigger it.
Now to the reasons for my high rating.
Yes, there is grind, yes you will spend time just letting MC sleep, eat and bath, yes you will be forced to spend time on advancing the days, until you get the right girl at the right place, BUT it's not so much that it really detracts from the enjoyment.
This is due to a) an in-game hint system and b) a walkthrough that is always up to date for the new updates, telling you how to proceed.
There are so, so, so many sexy ladies in this one. A whole ship and while many models are familiar, there is so much variation in type and personality that it's really fun to advance your relationship with them.
From the horny, sexy, french teacher over quite a few students with varying personalities and traits, to the repressed, old milf of a dean, to the gorgeous redhead captain and and and.
The sex varies a lot, you have peeping, lesbian and straight sex, three-ways etc.. And again, there are a ton of women there, it just doesn't get boring, at least so far.
Give this one a try, but do yourself a favour and use the walkthrough.
Pick your favourites, progress their stories AND how willing to fuck with the MC they are and enjoy.
Personally I like the girl who has a really complicated relationship with you, if you use the incest patch (she could be your mother of sorts, but also your daughter, we don't quite know yet), the straight A student that you turn into a sexy little minx, the captain just because of her absolutely smashing looks and I don't really know why, but slowly seducing the mature Catherine and making her return to her old fun-loving personality was my favourite so far, here's hoping I can to a lot with her in the next few updates.
Highly recommened.