On another matter, the story has been hinting that the (light-haired) former officer Miharu is looking for is Kagami’s mother, but we learn in this chapter that Miharu does remember the woman’s name.
Is “Kagami” such a common Japanese family name that Miharu wouldn’t connect that woman with her senpai? Or is this yet another mystery woman from the past?
I was lost for a moment there since we didn't learn that in this chapter and it had been a while since the last update - after re-reading the chapters so far, we learned this in fact in chapter 8.
It is a good question, though - and while it may be Kagami's mother, the lack of name recognition is now joined by Shinobu not recognizing her from the picture, although it being Miharu drawing from memory, it may not have been as similar to the actual woman as she thought, no matter how well drawn.
Another thing that comes to mind after re-reading it all after this chapter is Kagami wondering why her mom would suddenly want to come to see her in that same chapter 8 - which may well be a change brought on by Shinobu's letters.