Corpstalia

When Italy discovers a charm that could help him keep all of his friends together forever he is ecstatic to try it. At the next meeting he gathers up all of his friends and they perform this charm call Sachiko ever after. But It doesn't exactly keep them together. It sends them to Heavenly host Elementary school and they have to try and find each other and a way out before the spirits of the school take their lives
(Based off of Corpse Party.)