Yep, crossover happen even in the world of manga porn games. Especially when we have two similar characters like Elsa and Jack Frost - these two were supposed to fuck sooner or afterward! And this game make the second pretty shortly enough... The genre of the game is visual novel. Read (or skip if you ahere only for manga porn scenes) the dialogs and make a choice from time to time to decide where the story will go next. You will be playing as Jack who one days concludes up in the magic country he has never seen before - the kingdom where princesses Anna and Elsa rule these days! Ofcourse you will try to obtain all what you want from Elsa but who knows - could be Anna doesn't mind to suck a huge hard ice cream too? However, you will find this out only in case you will play the game yourself!
The second part of the story that should have happened one day since both of it's primary charcters - Elsa and Jack Frost - are controlling the magical power of cold so they have not so wide array of feasible lovers to choose from. And they even had their very first"confrontation" so to speak at the preceding part and it becomes more and more demonstrable for them that they should develope it into something larger and greater... but how exactly big and excellent their relations will become will be dependent on the player's decisions as well since the game is made in quite old-school visual novel genre which means that besides a lot of texts and prettily done artworks you will also be making choices from few options at the crucial points of the storyline and by that you will sette their fate.