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Chapter 7:
I don't know... So far this is pretty underwhelming for me. I do not believe anything about either the situation or the characters. I will give a few more chapters a chance, but highly likely will still drop it.
Chapter 12:
I've read, that the story picks up from chapter 6, that is volume 2, but it's more like chapter 9, at least. It's still a bit... Over the top, I guess, very "loose", but at least somewhat more intriguing now.
Chapter 72:
I find it inconsistent, that Kei was able to move after 1 minute of being shot, but Kaidou was not. And I did not see an explanation for that.