Carmilla, a student pursuing journalism, encounters a group of youngsters engaged in a role-playing game called “Eternal Blood.” Her curiosity is piqued by “M,” a young man she meets during a philosophy seminar, who introduces her to this intriguing pastime. During a peculiar gathering at a deserted house, the group encounters “Dahmer,” an enigmatic young man who performs vampiric rituals and soon begins to exert influence over his friends. Sensing something amiss, “M” discovers that some members of the group are actually being transformed into vampires. In his quest to uncover the origins of these legends, “M” stumbles upon a method to reverse the transformation. A philosophy professor provides him with texts that could hold the key to saving their souls.