After the previous Godzilla attack, a miniature arms race ensues to collect his cells. Concerned over Godzilla's possible return, the Japanese government uses the cells to create a new bio-weapon, ANEB (Anti-Nuclear Energy Bacteria). They seeks the aid of geneticist Genshiro Shiragami, who's experiments result in a new mutation.
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.
When noble wanderer Moritaro saves a disowned merchant’s son from gangsters, he becomes entangled in a town’s struggle against corruption. Teaming up with a rogue monk, bold tea-picking girls, and even a reformed thug, he battles a violent crime boss exploiting local families. Amid betrayals and brawls, justice and solidarity triumph.
