Nice to see confirmation on Mikura being a clone.
Concerning the end of the chapter and her goals, I think there's still a lot that we're missing. It's clear that at that point she wants to use Maru/Yamato's ability to eliminate the man eaters and save what's left of humanity's future (and shape it in what ways she can in her ideal), but I get the feeling we're missing information between this point and when she passes away. It's important to note that she when she grabbed the CC. Typha, she said that if it exists then what Sawatari said must've been true as well, followed by "Either Yamato or the other one will do." This seems to imply that she wasn't planning on using it and only wanted to see it for confirmation about the rest of the diary. Also, Kiruko noted Mikura seemed to actually be fond of Maru at the end, and if she told him to use the CC. Typha on Yamato then that means she likely knew he was the clone, which begs the question of how did she know that? I don't think this is the last we'll see of Mikura. Another question is why she didn't have Maru use his ability to kill her and prevent her from turning into a man eater?
Personal theory, but I believe the hiruko that's made a cocoon around Mina is Tarao. The official translation here says that Michika thinks Tarao
did throw a rock, and strangely the diary is found by a carved rock. The September 20th entry is likely referring to Nata becoming conscious again and then their unit being maintained.
Overall pretty crazy chapter, feels like it's setting everything up for the final act and would likely be the end point for s2 (if it happens).