The Magic in this Other World is Too Far Behind! (Manga) Volume 5 by Gamei Hitsuji

The brutal fight with Rajas comes to a close with unforeseen consequences for Lefille. Suimei does his best to get her to the Empire in her... compromised... state, but they have little idea of the intrigue that awaits them across the border. Meanwhile, Felmenia manages to catch up with Reiji’s party as they stumble across the aftermath of a certain slaughter. Caught between demons, Duke Hadorious, and a Nelferian princess, it’s unclear who their most dangerous enemy is at this point.