Codes :
During the game, jump into "Area Map" mode (L2) and enter any of the following codes:

Refill Blood:
Up, Right, Square, Circle, Up, Down, Right, Left

Refill Magic:
Right, Right, Square, Circle, Up, Down, Right, Left

Access to all the FMV sequences in Dark Diary:
Left, Right, Square, Circle, Up, Down, Right, Left

There are no sounds or signals to show that the code worked, so there is no immediate way to tell if you did it right or not. The codes can be done more than once, but a new screen has to load in before you can execute it again.