If you have a grudge against someone, go to the Hell Correspondence website at midnight, enter in your grudge's name, and the Hell Girl, Ai Enma, will arrive to grant your desire. However, the cost of releasing oneself from such a burden is high: in exchange for sentencing your tormentor's soul to Hell, your soul will also suffer eternal damnation. Ai has encountered many willing to pay such a price throughout her lengthy watch as the Hell Girl. Ai and her mysterious colleagues continue their task in Jigoku Shoujo: Yoi no Togi, ferrying soul after agonizing soul into the depths of Hell. However, a mystery female has been following them recently.