Haibara, Emiko, and Shohei stumbled upon a town where nobody speaks a single word to each other. However, there is a strange kindness to the town. The residents of the town are all "Epigonoids," who have a special power. What is their secret?

Enormous conch-shelled gastropods have surfaced in droves all over Japan. Despite Professor Yajima's protests, the government is propelled by the ambition of a certain figure towards the forceful extermination of the creatures. As a result, the world is gripped by fearsome circumstance!