Ep 25 – “Hell Girl” / “Jigoku Shōjo” (地獄少女)

This episode reveals the sad story of Ai’s past. Doomed to be a harvest sacrifice, Ai is abandoned in the mountains to die of exposure; her older cousin and only friend, Sentaro Shibata, tries to save her life by smuggling her food and water, but they are discovered. The villagers then bury Ai alive, and coerce Sentaro into helping; Ai’s grudge is born of this betrayal.