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?
We just have to put this silver key 
under our pillows and go to sleep.
Solo hay que dormir con esta 
llave de plata bajo la almohada.
Solo tenemos que dormirnos con esta llave de plata baja la almohada.
É só colocar a chave de prata debaixo
 do travesseiro quando for dormir.