Oh my god!
Tomia cosplaying as Hestia from anime Danmachi. I found these pictures from Tomia Facebook page.
Hestia is a fairy, right? Or kind of a goddess? I didn't know exactly because I never see the anime before. I just know from the hype of her iconic breast ribbon.
I had saw some cosplayers cosplay as Hestia, but Tomia is the best one.
Here it is, just click to enlarge.
There are some more cosplay photos she made.
Just go to her page here!