There is a curse on this one class, has been like this for every year since 1972 when a student suddenly died and instead of mourning, the class pretended the kid was still alive which invited death in. From then on the students of each year struggle to avoid a grisly ending.
At times it is a little slow, but the amazing artwork and layers of scary make this a very memorable watch. Word of warning, don't run down stairs with an umbrella, it's a horrible way to go.