Hmm, yes. I can work with this. I will happily take a split personality over the more usual death of a personality. This is kind of like The One Within the Villainess, but the original soul still has agency, which I appreciate.
in some panels the art is quite similar to
Maou to Yuusha no Tatakai no Ura de
(Reincarnated Into a Game as the Hero’s Friend: Running the Kingdom Behind the Scenes)
I even thought it was the same artist, but it's not.