 A routine flight on the airship "Tristian," turns into a nightmare when hi-jacked by a vampire, Aflred, who belongs to a radical vampire group known as Fleurs du Mal. After making a threat to the Vatican (by dropping the Tristian if his comrades were not released from Vatican custody), Alfred believes that things are going according to plan...until he meets Abel Nightroad, a traveling priest from the Vatican. Little does Alfred know that Abel is not like any ordinary priest.