It's like chapter 4, there isn't any mention of N, doesn't seem like it's totally unrelated though, that girl was from chapter 2 presumably ten years older.
I have a theory that this a game of hangman(based on the shape of the weird shrine) so I wanna say that chapters without the letter N are misses or the other way round. With that in mind, ABC and DE seems to have separate plotlines.
I can't tell how many letters are in the word or what language it is though.