Would just like to note that Y-San is from Redrum University, which is "Murder" backwards...
B-Kun is from Ecidius University, which I think is misspelled and was supposed to be Edicius as in - "Suicide" backwards. I dunno if this has to do with anything, though.
I'd also like to note, that the door was locked when the cops came, which is a bit weird, cuz it made me think she had escaped.