The story is set in Heavenly Host Elementary School, an elementary school that was torn down following the murders and disappearances of several of its staff and students. By the start of the story, another school called Kisaragi Academy has been built over the elementary school site. One night, a group of students from Kisaragi are telling ghost stories when a sudden earthquake transports them to another dimension where Heavenly Host Elementary still exists and is haunted by the ghosts of the school's murdered children. The students of Kisaragi Academy students try to find their way home and survive the other mysterious forces that haunt the school. This is definitely on of the saddest Anime that I've ever seen in my life and you need to go and watch it. There are only four episodes but each one is so sad. There's also a lot of blood and gore if anyone likes that. Anyway, go and watch it now, after I watched it I literally didn't leave my room for like a week because I was so sad. Enjoy~
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