I get the idea that the latest chapters are actually from the 2nd volume of the series. The first one still had a couple of chapters left.

The first volume contained 9 chapters in total but only the first 7 were from Nadeshiko Hiyori.
The other 2 chapters were from "The Girl Awakens With a Kiss From the Princess" and it's a different story : https://dynasty-scans.com/series/the_girl_awakens_with_a_kiss_from_the_princess