Ich hab hier mal eine kleine "Anleitung" gegoogled, allerdings auf englisch:
Starting a New Game Plus
After the ending sequence and credits have played, keep hitting the (x)
button and the game should inform you about the New Game Plus feature, as
well as allow you to save New Game Plus data to your card. Do so when you're
asked, but don't save it on top of your old file - you can't go back once you
If you happen to go to the title screen with some New Game Plus data
available already (say, by getting out of the save menu after you save some
New Game Plus data), a third option will be presented allowing you to begin
the new game. If the option doesn't appear (say, because you shut the power
off), just load up the data the old-fashioned way. This will spit you back
at the title screen with the New Game Plus option available.
This process happens after EACH playthrough, even if it had been a New Game
Plus. If you go through enough times, it's possible to get six of absolutely
everything you can carry multiples of (Mascots, Iron Man, Cat Nip...).
Ich hoffe, es hilft