Aiko and Yuya have been captured by CAAC (Control Agency of Artificial Creatures), led by Director Nanbara, your obligatory Badass Director Lady giving orders in the back of a fancy car. She’s in frequent contact with Dr. Isazu, director of the Kiryu Hospital and once the doctor in charge of Aiko’s care. Clearly lots of people are interested in Aiko.
Thanks to a clever tracking strip in his paper airplane (activated when he goads a guy into crushing it), the Divers get a fix on Yuya’s location before the government takes harsher steps to interrogate him and fill Aiko’s head with lies (they insist her family is dead).
The Divers ambush the captors when they try to move their prisoners, in a decent action scene that demonstrates the Divers’ coordination and toughness, even in non-diving situations. That they were able to so easily infiltrate CAAC and retrieve their assets speaks both to their exceptional skills and CAAC not expecting an ambush.
With Aiko and Yuya back, the mission proceeds as planned—even as there’s a sudden flare-up of the Malignant Matter behind the Gate, spurring an increased military presence, which launches tranquilizer missiles over the gate that manage to calm the Matter down.
While preparing for zero hour, Aiko nods off and her dreams include the POV memories the other Aiko—her real body with an artificial brain. She and her double are connected. Not only that, the Matter is attracted to her artificial body; but Yuya hopes a certain drug will diminish that particular effect.
Aiko has decided to side with those who cultivate and embrace her belief her family is still in there, alive (the other Aiko seems to have encountered them, after all). We’ll see if she’s put her trust in the right people. The Divers are pros who will carry out their mission to the best of their abilities, but they also seem to have taken to Aiko and want to help her out, in addition to, well, trying to save Japan and the world.
Once she and the other Divers are suited up in their “Live Suits” (a process that reveals a lot of her and the Divers’ skin), they head to the Gate. Just minutes after they’re allowed through, however, the Gate is locked down by the government. There’s no turning back; if they’re going to do this, it’s now or never.