Okay, I really have to ask as I feel I need to understand it more before I move on to my next Shadow--what the heck was?Kunino-Sagiri
It's an aspect of Izanami born from many shadows that merged with Namatame. P4G is very specific that it is not Namatame's shadow, but it does seem to represent the reverse justice arcana.
There's some pretty good info here you might find useful. Obvious P4 spoilers at the link.