I'm a librarian who loves anime, manga, and reading a wide variety of genres.
I don't even have words. THIS EXISTS. And I want it.
I came across it while taking a quick look at what sorts of books about rats have been published recently. I used to be extremely well-read on rats, at least in terms of popular non-fiction, but not so much anymore. I'm familiar with most of the stuff I've come across so far, except a few of the "rats as pets" books. I may try rereading Robert Sullivan's Rats: Observations on the History and Habitat of the City's Most Unwanted Inhabitants at some point this year, although that book was at least as much about New York City as it was about rats. A big "no" to Jerry Langton's book, though.
But this coloring book. It's totally getting added to my next paper book order.