This is pretty exciting.
I first read the first one of these about 10 years ago. The second one has finally been translated, and looks like publication is imminent. I hope the 3rd one doesn’t take as long!
What I like about these books is how poetic they are. They really expose the poetry of number theory. They don’t always give you the full details, often delegating them to 3rd party references, but they do give you that lovely beauty of the subject. Very motivating texts. I’m currently enjoying the first one.
The Japanese have an exquisite sense of aesthetics.