The Vexations of a Shut-In Vampire Princess, Vol. 5 (light novel) — Kotei Kobayashi

Knock, knock. It's the Church! A wave of religious fervor overtakes the Mulnite Empire as it prepares to receive a diplomatic visit from Spica La Gemini, the Pope of the Holy Church. But when the Empress goes missing on the day of Spica's arrival, it falls to Komari to tide things over with the guest of honor. Needless to say, our accident-prone heroine totally botches it by thoughtlessly expressing skepticism about God and organized faith, inciting the Pope to declare war on the Mulnite Empire. Soon, Komari and her fellow Crimson Lords are stretched thin quelling insurrections from angry believers. And to make matters worse, Komari's loyal maid Vill has been whisked away to the Pope's headquarters! Can Komari really pull through without the aid of her most ardent supporter?