Really interesting, chapter
Sochiro's father is very similar to him, even in terms of ethics.
What is Sanzu? Does it still exist in the present? Is It linked with Baal's organization?
Knightwalker has finally revealed his true intentions.
Now, we know his intentions weren't achieved (Ameri grew up happily with her father).
If Knightwalker had shown interest in humans for his own purposes, Narnia, on the contrary, showed profound racism towards them, demonstrating a completely different approach.
This makes me think that Knightwalker, in addition to seeing his plan fail, was probably defeated/arrested, (and this could explain Narnia's hatred towards humans).
Henry seems wasn't yet powerful enough to defeat him, so he must have been helped by someone (but who? Sullivan?), and after this Henry obtained the post of Knightwalker and a place among the thirteen (probably also with the aim of protecting Ameri?).
Regarding Merize, I'm increasingly inclined to believe that after Knightwalker's defeat, she was sent back to the human world to protect her from other demons and save her.