School Zone (manga)

School Zone (スクールゾーン) is a horror manga series by Kanako Inuki. The series follows a group of children as they discover that the many ghost stories, urban legends, and superstitions they have heard about their school are real.

Plot
There exist thirteen ghost stories about the school and, it is said, a terrible fate is reserved for those unlucky ones who learn all thirteen. One afternoon, one student tells the others the one about the human head found in the school elevator. Soon after, many students begin to experience strange and terrible encounters with the supernatural, and coming to school now becomes a struggle for survival.