A school was built on one of the Gates of Hell, behind which hordes of demons await the moment they will be free to roam the Earth. Hiruko is a goblin sent to Earth on a reconnaissance mission. He beheads students in order to assemble their heads on the demons' spider-like bodies. Hieda, an archaeology professor, and Masao, a haunted student, investigate the gory deaths.
The wall man is a strange wall-dwelling creature that is neither human nor ghost.
Satomi is a research student who travels to northern Japan seeking reported olden Christian relics. On the island of Hokkaido and in a village, odd deeds are occurring. As such, she bands together with another researcher and locals to uncover the truth and understand the infernal happenings of which there are many.
