Yes, Mami is a shit person, but she's also the only thing keeping this manga interesting.
I want you all to imagine what this manga would be like without her crazy, two-faced behavior; a manga with just Kazuya being meh, Chizuru pretending she doesn't like him, Ruka being in denial, and that mute bitch whose name I can't even remember.
Does that manga sound fun to you?
Don't get me wrong, I want Mami to get what's coming to her, and if she doesn't, I will be severely disappointed.
But, until then, LONG LIVE MAMI!!!!