If you're looking for something with a ton of blood and guts, this is your best bet! It's extremely graphic, gory, and by far the most violent I've ever seen in anime and my life. There's not that much emphasis on character development, the emphasis is put most immensely on the gore, horror, and sadistic ghost murderer plot. And when I say bloody, I damn well mean bloody - tongues are cut off, heads are severed, organs spill out of a bloody corpse, eyeballs are ripped out by a pair of scissors - I suggest not watching this at night. And please, if you're sensitive to killing and blood, I strongly urge you to NOT watch this show for your own well-being.
The story follows six students and their teacher stuck inside Heavenly Host Elementary School for the night, and for fun, they tell each other ghost stories surrounding the school. They also play a "Bloody Mary" like game to summon a spirit, for fun, until they realized they've actually opened up the school's ancient curse surrounding a sadistic murderer that mysteriously tortured and killed the schoolchildren, whose spirits are cursed to haunt the hallways and get rid of "intruders". To put the curse to rest, they must solve the puzzle to this crime - and pay with their lives.
