When we last left our friends they were between a rock and a hard place—or rather between a Matter-clogged tunnel and a CAAC assault squad. They’ve come for Aiko, and when Yuuya refuses, saying he has to keep going and that they would never understand, they fire shots at the Matter.
That turns out to be a bad move, as the squad leader is nabbed by some human-form Matter, throwing the rest of the squad into chaos as they try in vain to retreat. Our team learns from their sacrifice that the Matter is attracted to light, and uses flares to draw the Matter out of the tunnel, clearing their path forward.
That’s far from the only danger the team faces, as the Beetle is nearly swallowed up and the Evidence system proves too far behind the curve to keep up with the new Matter forms they encounter. It’s straight-up dicey out there, leaving Aiko to voice her concerns about putting the Divers in further danger for her sake and her family’s.
In a slight change from his colder manner towards her back at the rest stop, Yuuya assures her that compared to her, everyone else is expendable. But he’s wrong that they knew what they signed up for, because they don’t know Aiko is walking talking Matter bait. Thanks to a hot mic, one of them learns this, but keeps it to herself.
There’s a brief check-in with the three college friends. Nanbara loses contact with her squad, Isazu once again commits to saving his daughter, and Kurose learns with the help of a hacker friend that Isazu’s daughter is somehow connected to the Matter.
The Team gets through another guillotine gate by the skin of their teeth, but it isn’t long before they’re under attack, and as Yuuya is delivering ammo to the Divers, the Matter seeps into the Beetle, nabs Aiko, and places her in a fluid-filled cocoon.
Thankfully, it took a weapon with her, and she uses it to bust out, but she’s buried by the crystallized matter that trapped her, and by the time she’s dug out, all of the Divers see her for what she is: a composite being: human in mind, but artificial in body.
They’ve been traveling deeper into more and more hazardous territory with Matter bait. Will this revelation give them second thoughts about supporting her and Yuuya’s cockamamie plan? I doubt it. I don’t see Kazuki abandoning her, while Kaede is just happy to have the opportunity to fight in a place few humans have been.