I'm posting this cause I think many mangareaders that have only seen the anime and think the anime and manga are approximately the same

If you're one of the target people, prepare to be educated:
The story of the Akira manga is completely different from the anime's story.
The first volume somewhat similar to the first 2/3 of the anime, but later the story of the manga develops in a completely different direction.
So if you're not yet familiar with it you really should check it out. It's really good and might be concidered a required reading for mangareaders.