As a fan of Akiyama-sensei, I'm going through his previous works one at a time. This one is totally different from the other two I read so far. I was actually confused for the first half or so of the book. Part of it is due to my lack of Japanese comprehension, but I think it was written that way, too.
Imagine a space station built by "angels," who are no longer occupying the station. Many hundreds of years go by and during the time, cats who are evolved to be smarter are occupying the station. These cats have evolved (or maybe genetically modified) to have an antenna that can be used to communicate among themselves as well as to control robots that are left by the "angels." Over the years, they've developed their own society with their own politics, religion, and occupations. There are warriors (Spiral Diver), robot mechanics (Doll Master), and spiritual leaders (monks). There's the state police, too. There are other jobs like rat catchers and what not.
Of course, the "angels" are probably the humans, and the space station is currently orbiting the earth. What will happen to the society that considers the humans as "angels" and the earth as the place the deceased cats go, when the truth becomes known? Will cats listen? Will they care? Will they even comprehend? Think Galileo Galilei and the earth not actually being the center of the universe.
I don't know what will happen yet since I haven't finished with the second volume, but the story is surprisingly complicated. Most of the characters are so cute, though.
What makes his books great is that he doesn't try to teach you an idea, but rather gives you an interesting scenario and then makes you think about it on your own. Even a textbook shouldn't be just telling you facts.
