Has an anime or manga ever made you read/watch any other movie or book (no Light Novels allowed)?
I read The Pillow Book by Sei Shonagon because of pic related, which then in turn made me read The Tale of Genji.
I also read The Diary of Anne Frank after watching the anime when I was younger and finally read Alice in Wonderland and Through the Looking-Glass because of the Rozen Maiden manga and Kyousougiga, after they were in my literary backlog for ages.
How could you read the tale of genji after all the shit it's writer, Murasaki Shikibu, wrote about Sei Shounagon? Shikibu was a vain pretentious bitch.
Grave of the Fireflies made me read the short story on which it was based.
Howl's Moving Castle made me read the book. I hated the book
Sei Shonagon wasn't especially shy about critizsing and ridiculing others either, so she can't really complain. Also it's often assumed that Murasakis literary talent was superior to Sei Shonagons, and after reading these two books I tend to agree with that (though I'm obviously no expert and it might be a bit unfair to judge them based on that, since The Tale of Genji is a novel and The Pillow Book "just" a diary).
Okay, check this one:
Attack on Titan made me read A Game of Thrones because walls.