Responses
I think the major hint was when Katrina started to hang out with her, when she went back to her room to get a book that she had recommended her to read, Katrina had a flash back to a memory that overlapped with her of her perilous best friend from her last life.
So--someone told me there were hints that albino girl was the bestfriend(not from recent chap). Can someone tell me where those hints were??? I'm curious. The manga hasn't updated in a while so I've forgotten some stuff