The best way i can summarize this game is: "A offline Gacha pirate game where your objective is becoming the pirate king cause being rich is good"
The main selling point about this one it's the gameplay/ the Gacha elements, not the hentai (it's okay in general, you get in max of 2-3 scenes for each girl since there is alot of them) or even the story (It's just a background thing to justify what happens).
Also a important thing about this game it's lack of a level up system, you get the character and he will stay like that forever unless you equip some rare shit to give him/her some minor stats boosts, which consequently creates an tier list of what are the best and worse characters to use, so i strongly advise you to capture every single one possible to make your life easy.
Some side notes for the review:
The economy system of this game is simply broken, there is a really easy exploit to make yourself rich in like a 1 hour or less, heck, due to the entire game being opened to explore right on the beggining, you can get 100M Gold (Enough money to buy the best ship in the game) in less then 10 minutes if you know where to go of course.
Since this game has a huge amount of characters, they unfortunately aren't well developed, once they either join your crew or die, they will practically not say anything or interact with anyone in the world for the rest of the entire game, except for the final part of the game, also some characters are slightly quoted in being in your crew for other characters (only notice this once), but that's about it.
Final thoughts: A good game worth being played for it's gameplay system's, however due to the tier list, it ridiculously encourages you into wanting the best pirates and to forget about the rest (since many of them are really not worth using at all)