This free DLC adds 4 new romances to the base game: Kaden, Galina, Christophe and Lola. All the 4 characters can be romanced by both Diana and Alex, for a total of 8 new romance routes!
Another addition it's the "Quick Play Mode", in which you can play single battles outside the main story campaign, using the cards you have unlocked so far. You can choose between 10 different group of enemies, and tweak the AI starting/recurring resources, to fine tune the game to your skills and tastes.
Last but not least, you can now enable a "Suggestive Mode" in the game options screen (while in game) to see a naked/erotic version of the romance CGs present in the game.