A skin for Goddess of Victory: Nikke's Modernia, featuring her in an apparent naked shirt holding a doll of the Commander (see post #6624603). The costume is rewarded to everyone for free as part of the Doki Doki Nikke Global Popularity Poll held from April 12 to 18 of 2023.
The skin's name is likely a reference to the name of her submachine gun which she uses before she was corrupted.
This tag implicates modernia_(nikke) (learn more).