Hikikomari Kyuuketsuki no Monmon Comic

Terakomari, or Komari, is a shut-in vampire who wakes to find herself appointed as an officer. The corps she is responsible for has a reputation for overthrowing and killing its commanders, leaving Komari to face a daunting new role. Though she comes from a prestigious vampire family, Komari cannot drink blood and has little athletic ability, is small for her age, and cannot use magic. Her trusted servant Vill steps in, promising to keep her from being exposed. Komari’s struggle begins as she tries to handle her duties despite her shortcomings.