Why would she project her self into one of the girls in the love triangle?... could her and Neri and someone else also been in a love triangle?... could that person be... one of the students who left school in their year? i feel like Mayuri could be somehow connected to that... i have a theory but it is kinda reaching @_@ Yuzuriha told Suoh that she will know the truth when she becomes the president thingie... so maybe Yuzuriha has written the reasons why Mayuri and the other person who was in their love triangle left school?... it could be a procedure of the school that they know about and teach them how to deal with situations like that... it could be something Yuzuriha have done to get rid of the other girl who Neri loved...
*do not spoil me, please ,_,*