Heileen 3 continues the story from the end of the second game and takes place in the Caribbean islands. Traveling side by side with Morgan the pirate, Heileen will search for her missing friends, hoping to reunite with all of them. 

But that's only the beginning, because the story continues! You'll have a fixed amount of in-game time to unlock a romance or a profession ending! Do you have what it takes to make it?

The game plays like a raising/dating sim, in which you can learn several different skills and unlock advanced activities.

The Virtues/Sins system of the second game is present as well, making every decision you take in the game shape Heileen's personality.

Source: https://www.winterwolves.com/heileen3.htm