Das wrote...
Mayoi filled the heroine_of_the_week shoes quite nicely
It's probably just me, but I find it funny that you refer to her as a character-of-the-week when the whole arc has been about her.
Anyway, this was an enjoyable episode with some surprises. Hitagi's confession being the biggest one. I am disappointed in myself for not seeing that Mayoi was a ghost. It explains why Hitagi didn't start saying things about Araragi's smallness after he defeated and then laughed in victory over the loli. I thought that maybe Mayoi's mother had moved somewhere else or that Mayoi's mother was dead.
Edit: I do wonder if Araragi's violent tendencies are another side-effect from being turned into a vampire.