Throughout the years, adapting popular manga series into anime has been a slippery slope. While nowadays, most adaptations stick to the source material, older titles often deviated from the manga’s storyline in unexpected ways. Such drastic changes normally spell out disaster for an anime’s popularity. However, some adaptations are a hit with fans regardless.
Source：https://www.cbr.com/anime-that-dont-stick-to-the-manga/
