That's true, but since they showed her in that outfit in the OP and ED I wonder if it still counts as a spoiler?
I am going to throw a guess based on Komi's comment that one of the spoilers is that Momo has some symbol or magic tatto where Yuko's left arm is covering her,maybe some kind of curse Shamiko did by accident? what I want to know is if the dynamic they have in the picture also counts as a spoiler or it's just the usual "reversal" from fanart