Aaaaaaaaggggghh, it's so frustrating to me because Yume is so clearly unwell but she has enough of a handle on everything to be this sort of perfect, manipulative bitch it starts interfering with my suspension of disbelief.
So much for all the theories about her up to now. She's full on schizophrenic.
If you suddenly start seeing and smelling garbage due to anxiety from a class change please don't start making decisions based on what the garbage wants from you. Seek help immediately.