Anime has always been a home for adaptations, with many of the earliest anime shows and movies adapting popular manga, folk tales, and novels. This tradition hasn't slowed down with time, with a good chunk of each new anime season being made up of adaptations of popular manga series. But it isn't just manga, anime's inherent flexibility as a medium means that many beloved stories from other mediums have received anime adaptations.
Source：https://www.cbr.com/forgettable-anime-adaptations/
