I would never do it for a singular book but I did learn Japanese because I was into manga and anime like thousands of people. Now I have experience living in a

I would never do it for a singular book but I did learn Japanese because I was into manga and anime like thousands of people. Now I have experience living in a foreign country, Japanese friends and I read manga I bought in Japan on the train to work every morning. Learning a language to any level that is useful will usually take you at least 2-3 years if not more depending on the language. Japanese was pretty hard. Took a long time. So yeah, it will change your life dramatically in ways that are more beneficial than just reading a book simply because your whole life will be pulled in a slightly different direction due to the amount of your attention you're putting towards this one thing over many years. However, if reading one singular book is your motivation I find it unlikely that you'll achieve it.