She's The Strongest Bride, But I'm Stronger In Night Battles: A Harem Chronicle Of Advancing Through Cunning Tactics (Manga) Volume. 4

MARIDA BATTLES HER TOUGHEST OPPONENT—THE COMMON COLD!Marida and her demon clan are on a mission to crush the traitorous Froiger family and claim their territory in the name of the emperor! With Albert’s brilliant strategies directing the charge, even the enemy army starts to tremble. Just as victory seems assured, disaster strikes. Marida, the family’s fiercest fighter, comes down with a serious cold! Can the demon family pull off a win without their star warrior, or will this sniffle seal their doom?