For the sake of god, read the manga instead
But really.. if you liked this 2 movie.. read the manga.. even if you read it in english [even tho i recommend to read it in japanese] you will get a much better story [the original] with way better character development, and better pacing, better explanations... the manga is a fucking emotion bomb with action, gore, nudity, romance, friendship, slice of life, adventure, the best character development that i ever seen etc,,, everything you can imagine that you need, you wont find any other manga like this i can guarantee that for sure!