You entered school yet again, still shaken after what you saw Yui turning into. Suddenly, you see her friend (and rival) Mai. She starts talking about Yui for a while...before showing her true intensions. She suddenly turns and bulge into a muscular red demon with long horns and yellow eyes, her clothes couldnt even hold her new form so they just ripped into two

"Ha! I bet im stronger than Yui, right senpai?"