A journalism student, Carmilla, meets a group of kids that play a role-game called "Eternal Blood". She becomes interested in this hobby through "M", a young man she met in a philosophy seminar. During a strange party at an abandoned house, the group meets "Dahmer," a peculiar young man who introduces the group to rituals of vampirism. "M" sees the situation is not normal and shortly realizes that some of them are actually being transformed into vampires. Using ancient texts, "M" has to find a way to revert the vampire process before the souls of the transformed are too far gone to be brought back.