Well, that's a Life of Pi ass twist. Still, seems like the crew isn't as hopeless as we thought, what with Minerva's manual and such. I'm sure they'll make a macguffin out of that.
And the plot thickens so the outside world isn't as described either the demons have terra formed the earth to their liking or they been abducted to their home world.
Also it seems this Minerva person has also given them info to guide them to where he is.
As of right now I'm suspecting Minerva might be that guy Isabella use to love but it might be too obvious for a series like this so maybe it's a character we haven't met but who knows if they can truly trust him when they meet it seems there's obstacles in every corner.