I strongly recomment the Manga "Holyland" !!
It is the best Manga I have ever read.
Its about youth and gangfights in the streets of Tokyo. If you are in martial arts you will be impressed how intelligent this Manga is. It explains very deep aspects of martial arts by street fight situations. Its unbeliebeable intelligent.
And it also touches by friendship, drama, love and impotant questions how to find your way in life and what kind of responsebilties and also obstacels you will face if you try to find it.
Get it! Its highly impressive. The first 3 or 4 issues are a bit dull because the story is setting up step by step. But when it pick up speed this manga is breathtaking!!