2x14 - Hell Girl

A washed up writer decides to take revenge on a producer friend of his who became famous. During his attempted revenge the producer's wife is killed and their son is framed. The son contacts Hell Girl but decides not to go through with it. Shortly after this the producer is killed by the writer, but before the writer can kill the son a woman whose child he killed sends him to hell. This show is significant because it introduces character Takuma Kurebayashi, whom Ai empathizes with.