Not a fan of Ruka, but she got major points in my book for being the one to finally put Mami on her place!
The bitch's been toying with the mc ever since before the story even begun for absolutely no reason other than, what I'm assuming to be, her need to make someone miserable just because she is not happy!
Mami deserve that proverbial bitch slap and Chizuru would never be able to do what Ruka just did!