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!

In the past, Michiru was a member of a track and field team, but is now wheelchair-bound after an accident. She helps the monster Falmagan, which was being bullied, and it falls in love with her. Falmagan is determined to heal her legs. There is a way, but it must sacrifice its own body in the process.