Redeem with a GM STA and one of each Section ID card to unlock an STA costume where it's Brightness Circle armor effect, but it's replaced with each Section ID card spinning around you.
No one ever managed to gather all the ID cards so far.
Would be cool to reward such achievement with some unique service, I thought about the ability to redeem one item to 100 hit.
I guess some unique skin would be nice alternative as well.