Episode 2:
As a man, I would never have guessed, that I would say that boobs has ruined a show for me. But It happened. I just don't get it why there is so much focus on them. If this was a harem anime or an ecchi romcom - I could have accepted it. But this is supposed to be a show about supernatural. Boobs are not supernatural. I mean, aside from boobs acquired through plastic surgery, especially if they are excessive (since "supernatural" may be interpreted as "not natural").
But even when I try to focus on the supernatural stuff... It's still not good. Firstly, it still finds a way to divert into sexual talk (although it may make sense in context of the 2nd episode), which does not add anything. Secondly, why would they even think about possibility of someone questioning identity of some random girl, who dressed up in the uniform? And why did they not discuss the need for Sumireko to hide in the toilet for most of the day? And if she was hidden then, why not tell about that "mark" right away? They call it "plan", while Ren also suggests that he has experience doing this stuff, but... Does not look like a well-thought-out plan to me.