Juuzou politely declines a job offer from the imposing Brother Huang of the Kyusei group to find and eliminate someone stealing extended limbs from kids, because he thinks people should “wipe their own asses.” But what if someone can’t, either because they don’t have arms, or can’t move the ones they have?
Juuzou trusts actions over words, even what he deems are sincere words from Tetsuro about saving the other children imprisoned and tortured by Berühren as they speak…only Tetsuro isn’t really speaking with his own voice; he’s using a spare Extended head’s voice.
Similarly, in order to actually carry out the saving of those kids, he’ll need to rely on bodies other than his own, which was made all but useless by the company. Juuzou tells him any attempt would be futile; the world is an unfair place, and Tetsuro needs to count what blessings he has and move forward thinking about himself.
Tetsuro can’t accept that, and won’t sit back and do nothing. Instead, he uses Harmony to hack into Juuzou’s body, which he uses to carry his own body (lest Mary try to disconnect the two) as he heads out in search of the people hurting kids. When he almost falls victim to parts scavengers, he covers Juuzou’s head with a sack.
Then he seemingly lucks out when he spots two distressed-looking girls in gray frocks running from a man with swords for arms—just the kind of people he wants to save. Only Ende and Anne are not really on the run; they’re the very people stealing parts from kids, on orders from Berühren. They were also ordered not to let any witnesses survive, making Tetsuro/Juuzou their next target.
Of the two, Ende is capable of transforming into a monstrous mecha-spider woman, but even with Anne by her side for emotional support, she easily goes berserk, and in any case is in constant pain. Anne just hopes they can return home to Berühren for maintenance, and believes that Ende’s body will be put “back to normal” as a reward if they complete their mission.
Berühren’s stooge, however, considers the two to have failed their mission when he meets up with them, and orders the two test subjects immediately “retired” (in another nice nod to Blade Runner). Both he and the company never saw Ende and Anne as human beings, but mere puppets; tools to be used and discarded when the desired results aren’t achieved.
And yet, even though Anne and Ende tried to kill Tetsuro/Juuzou, he still comes to their rescue here, since he already knows what they’ve only just figured out: Berühren can’t be trusted, and can only be opposed. The girls don’t trust adults, but hopefully someone who can transform into a mecha-spider woman can come to believe Tetsuro when he insists he’s one of them, and is merely controlling the big burly adult body they see. It’s a tough sell, I know.