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If you like mathematics you are going to enjoy the book. There is a plot as well, but it takes a while to get going and overall the book is pretty math-heavy. The story itself I would probably rate at around 3 stars. My main source of enjoyment came from having fun with mathematics.
The math featured ranges from around high school to university level. I could follow most of it even though I haven't formally studied mathematics, but some parts went over my head. Important new vocabulary is bold and with furigana, making it a good resource if you want learn some maths related vocab in Japanese.