At the end of Memories 0.1 to 0.3, keep the cards and the 3 present on your Assassin boards. Recover your lost (your 3 initial and those added by your armor if you are wearing one).
Before starting the next Memory, you can freely trade and equip Equipment. You can also store or recover unused Equipment from the Villa envelope.
If you want to pause your campaign and save the game, go to 42.