I've spent time in Japan so when I saw the Tokyo Vice TV series on HBO Max I was intrigued. Watched the series and it was good enough I decided to read the book.
The book is very interesting. Quite a bit of background on Japanese society and on the Japanese underworld. Some very sympathetic characters and some real scumbags too. I recommend it, it's a good casual read but not lightweight and you might expand you're horizons a bit.