This one goes deeper into what makes us human. What's the difference between us and basically a andriod, and if they can remember and learn from us, how is that different just because we have a heart, and they don't. Even further we have a storyline at the end that connects losing our memory and how they would lose theirs since their parts expire.

It's a deeper, maybe even darker, volume this time. I really enjoyed that factor though it was a bit slower and slice of life style than the funnier volume 1. But overall I did enjoy it a lot still and going to for sure read volume 3.