At first I was just watching class antics. Then went with Kafuka into another classroom, where she flipped (got the dead-eyes look of college student mode and the sweetest of smiles, which scared me to no end) and started telling me how it's a good thing I decided to let her help me. (There was Traumerei playing over speakers, too, just w/o lyrics).
I can't really remember what was happening next, but everything she spoke was simultaneously happening for real in my mind, and she was telling freaky things.
One theme was centered about idea of being buried alive together with her (with Chiri's help, perhaps), and then there was that almost-sex with her part when everything around went blank/white, and I figured I was completely paralyzed and could just listen to her sing about how she drugged me and is gonna vivisect me (not sure, but I think it was that or something like).
But even without all the talk, just being alone with her suddenly turned from "great we're gonna have us some fun alone" to "holy fuck I wanna go home". Kind of dread that only happens in dreams. Of things I can't remember what was happening, just the feeling of batshit scare.
Of the thing with the whole class at the beginning, it was pretty much standard routine, Ai apologizing to Kaere about this or that (for which in fact Meru was to blame), stealthy half-transparent Usui trying to sneak a peak under Maria's uniform, and Nami complaining that the dream was all too normal.
Visually it was pretty much in SZS style just from first person perspective, hard to explain, but 2D girls were still looking mostly 2D. And that flat-color switched scenes were frequent but I didn't think it's strange.
Then Kafuka came and asked me to follow her, and at that point I was still aware it was a dream and was happy things were going in good direction.
Then all the psycho shit started rolling on heavy and I lost it completely.