The Banshin had been built in a day rather than 500 years, and Nyarko, Kuuko, and Hasuta are ordered to leave Earth as a result because they aren't needed anymore. The group goes to check to see what the Banshin actually is, as it determines if they really do have to leave or not. Will Mahiro have to say goodbye to Nyarko, Kuuko, and Hasuta?