Jato (자토, Jato) is the planet of Denma.
Edel asks O to find out where Nell is. So O found Nell. Edel heard the news about Nell from O. O tells Nell was in great condition after spending 5 months at the hospital, but her test result on Space disease came out positive and she serving as level zero care nurse out in the battlefield, in here. O shows Edel to Nell's blog. The blog tells they say that there'll be a final air raids in 5 days. That will be the end of everything.