User blog comment:Mizuhara Yukie/Do you guys think that Mizukawa Minori and Potomuri is actaully ONE person?/@comment-4726368-20130730080848

I agree with everything you just said there! Looks like I'm not the only one who thinks Potomuri is Mizukawa then~ xD

But the clue from Episode 11 when Mizukawa saw Manabe and Minaho, then Potomuri told Kuroiwa, I think that was the biggest spoiler about it.