Though she was born into a prestigious vampire family, Terakomari Gandesblood, or Komari, is unable to use magic because she refuses to drink blood. After having chosen the life of a professional shut-in, a maid named Villhaze suddenly appears and informs Komari that she has been chosen as the newest General of the Moolnight Empire's Seventh Battalion (comprising solely of mutinous ruffians)! Follow the slapstick struggles of a heroine who takes full advantage of her dumb luck to get out dire situations!