Ah, good pick forum newbie. I'm bias as heck to it :)
To get the Marina's POV do this:
Go to game menu. Select the third option. CG menu will open up. Open the second option. First and second pages are husband's POV and should be open since you played the whole game. Navigate to 3 and 4th pages. These are wife's blurred scenes ingame that you will now be able to see clearly. All scenes are row wise. If I remember correctly, first column is the whole scene while the rest of the columns are same scenes but broken up.
Atelier Sakura games are unique this way when it comes to the lover's POV. For starters, you can't save them. Either just run the whole scene or run it in pieces. And then you will have to select the next scene manually.
Enjoy.