A few days late to this, but I'm finally reading the bonus chapters, yay!
Side Story 1: We get to see #10 and #9 in battle together against the remnants of humanity. We even get to see #10 shielding #9 after it gets damaged... That's... going to make things awkward in the next volume when they both try seizing the human base...
Side Story 2: ...Well, that umbrella doesn't look like its in the best of condition, but... Well, if she's dry enough, I guess that's all that matters!
Extra Chapter: Taking Damage! Taking Damage! I guess with no other humans to learn from, she never learned to say 'ow!'...
...And I want mechanized precision grooming implements!