Tensei Shite Shota Ouji ni Natta Kensei wa, Katsute no Deshi ni wa Zettai ni Baretakunai - Vol. 3 Ch. 16

[MangaDex]

 

[VooXoo]

I understand why this manga lasted so shortly, the MC is a old man in th einside but in this last few chapters he is more naive than a kid, the whole thing of going alone to get this ass-assin and not let the kingdom hunt her ass with everyone, he himself included, thinking she wanted to off the king made him look retarded.
Maybe it was planned like this, or maybe the amount of negative reviews after last chapter and readers abandonment finished it.