I was trying to find the source of this picture from the clue at the bottom right corner where “kyoistheology” is written there. Unfortunately, I came up with nothing.
The thing is, this cosplay is too generic to tell for certain. It could be Souma Ayame from Fruits Basket but I don’t remember a scene like this in the series.
Anyone have a better idea?
EDIT: Thank you, Mree, for commenting that this is Superbia Squalo from Katekyo Hitman Reborn!
