Hiruko the Goblin - 1991

Behind one of the Hell's Gates, where armies of demons await their release to wander the Earth, a school was constructed. Hiruko is a goblin on a reconnaissance trip to Earth. He beheads students in order to attach their heads to the spider-like bodies of demons. Hieda, an archaeological professor, and Masao, a student who is haunted, investigate the gruesome deaths and ultimately engage in combat with Hiruko.