I forget all the names here, but this is definitely a top 10. Dont get attached to the first pink haired girl you see thinking shes the main character; she disappears and is found dead days later in a forest outside of her small town. After this incident, the town doctor sees several patients who are suffering symptoms that would suggest they are missing a lot of blood, but there are no external wounds besides what appears to be a bug bite. But each patient disappears every night and each dies three days after the initial symptoms. The doctor thinks hes dealing with an unstoppable and unexplainable epidemic, but as he discovers, the town's foe is something much worse: vampires.

I include this in Horror because of the severe psychological factor. A female animation artist is attacked in an alley one night. She says that her assailant was the notorious "Shounen Bat," a boy on rollerblades wielding a bent golden bat used to club his victims over the head. But the police dont believe the story because Shounen Bat is believed to fictitious. However, after this, more and more victims of major head wounds start claiming that Shounen Bat was their assailant. The end of this anime is sick and gut twisting when you realize what has really been going on; then deeply disturbing when you figure out what caused it all

A new student is admitted to Class 3. This additional means an imbalance in a class ritual attempting to prevent a certain catastrophe: a curse that causes students of Class 3 to die one-by-one every month of the school year. Before the new student, the class was able to prevent the curse by pretending that one of the students (Misaki Mei) just does not exist. However, this is no longer working. The curse has begun and the other students are trying desperately to stop it.