You know the original Akiko was useless and a baggage, only good for companionship, this one however is detrimental and an active impediment towards survival.
i just read the manga from the first chapter
my guess is that she suffer mental issues , PTS maybe ?
from the time she fked up with the rats and got yelled at .
So this random spy nonsense is a story line now... The apocalypse has happened and people have time for spies now? OK... So she's now a spy from her actions. This just went from interesting to stupid.
Yep Akiko is definitely crazy. Although that was a valid question about why the locals were living underground. Not only would it cause Vitamin D deficiency but underground is probably one of the worst places to be during an earthquake.