Himekawa is a guilt-stricken by her failure to protect the citizens as they boarded the Tokyo megafloat.  When a mysterious radio signal is picked up by Atraxia, she leaps at the change to perhaps finally save a civilian.  But when Amaterasu arrives at the source of the signal, they find an enemy from another world, and one deeply connected to Himekawa's past.
All the world's megafloats have had their 
communications cut off from one another.
Todos los Megafloats
cortaron sus comunicaciones.
Todos los Megafloats
 cortaron sus comunicaciones.
Todas as Megailhas do mundo tiveram suas 
comunicações umas com as outras interrompidas.