You’re a powerful vampire boss of a territory in the Demon World. Unlike your vampire ancestors, you prefer not to prey on humans, and would rather indulge in their Japanese otaku lifestyle of reading manga, watching anime, and playing video games. One day, you become excited when Fuyumi Yanagi, an ordinary Japanese high school girl, accidentally wanders into the Demon World through a portal. The two's first meeting is cut short by the attack of a demon who challenges your territory. When you go to stop the demon, Fuyumi is killed by a carnivorous plant and turned into a ghost. You take responsibility and pledges to help bring her back to life.