Vampire hunter D takes on the case of Doris Lang, a farm girl bitten by the Nobility lord Count Magnus Lee and racing to be cured before the transformation takes hold in the ruined world of 12,090 A.D. Magnus's daughter Larmica refuses to let a human into the family and wants Doris dead before any wedding can happen, while the bandit Rei-Ginsei and his Fiend Corps want Doris for themselves and treat D as a rival to remove. This is the original light novel that started the Vampire Hunter D series.