S1·E8 Silent Acquaintances

In this episode, Enma Ai meets a small girl who reminds her of something memorable. That girl's dad is researching Jigoku Shoujo and the Hell Correspondence, trying to write an article called "The Truth about the Agent of Revenge" about them. His daughter however, acts weirdly due to her encounter with Enma Ai, and starts to see things related to the people seeking revenge. Meanwhile, Tanuma, a young woman, is out seeking revenge on her former boss for harming her best friend and misrepresenting money.