Any reason to get all S ranks in Faselei?

Actually did run through this game once more in an attempt to get all S ranks, but in the very beginning 3rd (or was it 4th?) level I let it slide with an A rank, which wasn't even the hardest level, should have redone it before I saved to get an S rank. Other than that, is there any unlockable secrets if you get S ranks across the board? Once the game was completed, I was no longer ranked when I cleared any levels, which is understandable since I'm so beefed up on all the awesome accessories and Toy Soldiers.