The Most Heretical Last Boss Queen: From Villainess to Savior Novel Volume 4 was written by Tenichi with art by Suzunosuke.

When Prince Cedric of Cercis comes to Freesia seeking an immediate alliance, Pride isn't sure what to make of him. The gorgeous fan favorite from the otome game is a selfish, bratty hothead who thinks he can seduce his way to success! Not only that, but he refuses to elaborate on his nation's peril, leading the two royals to butt heads (literally)... That is, until Pride gets word that there's war on the horizon. Can Freesia and Cercis unite in time, or will Cedric's stubbornness condemn his country to conquest?