[Mesnick]

Speaking of Sachika's reaction to Lango, I think it's time to voice my crazy theory. Let me start with the fact that the opening strongly hints that Sachika will face the fate of a rider. Otherwise, in her bubble, she would be in civilian form, and not just nothing. But I also have a hard time believing that she will undergo an operation similar to the one that Hanto had, unless this is not the only way to save her life. Plus, it doesn't explain her reaction to Lando.
So we need to find another explanation.
Who is Lando? The current head of the Stomatch family and the Dark Treats corporation. He produces drugs from kidnapped people and deliberately targets high-ranking Granutes. We'll get to know their aristocracy better through the twins, but isn't it obvious that there should be opposition to Lando's actions?
Now what defines Sachika? She helps people. Moreover, she is ready to help with absolutely everything. Who else on this show does the same thing? Gochizo. What is Gochizo? A special type of Agent that emerged from Shoma through his hybrid nature. What we know about Agents is that the stronger the Granutes, the stronger and more skillful they are. Temporary workers, as I understand it, do not have the ability to produce them at all. So it's logical to assume that Granutes' top-class Agents will be even more capable than Lando's. Especially if talented scientists work on them, including two candidates just from those shown.
So my theory is that Sachika is an Agent and... an agent. Sleeping, because she herself does not know about her own nature before activation.
Of course, there are things that do not fit into this theory. For example, Sachika's reaction to the other Granutes and her having a grandmother.
But if we imagine that this is an ultra-delicate operation of one of the high-ranking Granutes (or even Nyelv or Dente), this can be explained.