Ep. 2: The Possessed Girl

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Ryouko Takamura has been tormented by a seemingly unstoppable stalker for the past year. Her family seeks the aid of investigator Kouichirou Kisaragi, unaware that he is in fact the stalker. Ryouko accesses the Hell Link; Enma Ai, the Hell Girl, gives Ryouko a doll with a red string around its neck; if Ryouko removes the string, it confirms her contract with Hell Girl and sends her enemy to Hell. Ryouko hesitates, but when she is kidnapped by Detective Kisaragi, who also attacks her father, she sends him to Hell in self-defense. (Source: Wikipedia)