We should really cool it with the anti-Ami remarks. She's the best niece you could ever ask for and waits on her uncle hand and foot. She's the very model of a modern cutie daughterfu. Ami is so cute.
Edit: Oh yeah, damn! this reminded me of something else. Not gonna lie, I'm getting a bit schizophrenic with old age, or I mean, a bit Alzheimer'd. It was in chapter 4 that the narrator said an astute reader would realize the knocking each morning was only in Sensei's head. This parallels the fact that in Nothing is Beautiful, the protagonist is constantly hearing the knocking of his dead mother (she died, tragically, of cancer. I think. It may have been space aliens. I don't entirely remember the lore.) This is a really intriguing factor. Not as a clean-cut, aha, gotcha, Ami ain't real! kind of thing. But more like the thematic parallels and the rhyming poetry within. What kind of person is it that hallucinates knocking? What may have inspired this? Where are they doing this? What significance is there in this shared attribute? etc. And most importantly, how primed is Selebus for a reveal wherein a non-Ami character says "I am the one who knocks." before a Breaking Bad stinger plays and a character holds up a can of delicious, refreshing Coca-Cola?