Sadly this is one of the worst arcs in the game, because it lays bare the sheer amount of plot holes and contrivances in the game for all to see.
Like, seriously, —ING INVISIBLE SOLDIERS in a —ING INVISIBLE COUNTRY with a —ING amnesia global effect. That's the best they can come up with.
And all the revelations made in the arc ultimately makes all of the sacrifices and 'twists' and shoehorned-in hyperbolic time chamber children in the other arcs utterly pointless, and also weakens the characterization of ALL CHARACTERS in the process.