Let's not forget that Jeanette was made out of black magic because he wanted something to be stronger than Claude. So, from the beginning, Jeanette had black magic within herself.
I am not sure of this will help you understand....
I mean yeah I know that but what was the meaning of what he said???
I thought he was changing a bit and started to see jeanette as more than a black magic tool...
I mean same. I was starting to like him, but then the last scene came, and I was like 'nani?' I guess people can't change from day to night¯_(ツ)_/¯
What was the meaning of the last scene though???
Will that damn black haired claude use jeanette with the help of dark magic??? Like what???!!!!