A former 3D theme park attraction at Sanrio Puroland. A spaceship called Earth is dispatched to investigate the disappearance of its counterpart on a monster-filled planet beyond our Solar System. Once there, it quickly spots the downed craft, and is promptly attacked by Mothra and Rodan. It spots Godzilla and opens fire on him, giving the Planet enough time to escape.

When he returns to Earth to attend the wedding of his friend in Saipan, Musashi meets a beautiful girl named Shau who claims to come from the bottom of the sea. Just then, Monster Scorpis reappears in the sky above the island and Musashi faces the monster in order to protect the girl. What is the girl's true form? And what is the strange shadowy form that follows the monster Scorpis?