Ai Enma is the Hell Girl: anyone who submits a name to her Hell Correspondence website at midnight receives a straw doll with a red string. Pulling the string sends the target straight to hell, but the price is absolute, since the sender's own soul is also damned upon death. Journalist Hajime Shibata and his daughter Tsugumi stumble onto the Correspondence's trail and begin investigating Ai and the three spirits who carry out her contracts: Wanyuudou, Ichimoku Ren, and Hone Onna.