If I have to guess what will happen from now on, I'd say Ren will win. But not by far. It will certainly hurt a bit of her ego. And then, she will be proven wrong the "hard way"...by "losing" to the gods plan, understanding that she shouldn't have accepted this deal. An other example of what her arrogance can cost. Until Kyoka, Yuki and their friends save the situation. And so..the begging of the Ren's downfall !