Akira
Can you get better than this?!? In every sense! Adaptation: didn't even adapt the full story but made it accessible to people who haven't read the Manga whilst doing the original Manga so much justice that fans of it loved the film.
The writing. The voice actors are absolutely amazing! Even the English dub is top tier! The score is infectious to a degree that I have had it on everyone of my playlists since I was 12!
And lastly, the flipping animation! I have not seen better from anyone! Ghibli included! Takes my breath away every time I watch or see a clip!
And last bit not least