Bremen
Kusaga Romio, goes to Tokyo to become the "God Of Rock".
On his way he gathers Hino Reijii, Hayama Ryo and Fujii Ran and they found the rockgroup "Bremen" (guess where the title is from). Together they try to rise in the rock-world which is filled with troublesome guys.
Although this manga won't blast you away, you will really come to like Romios's free mind.

Hareluya 2 boy
Basically, this manga follows Hibino Hareluya as he tries to "conquer the world" by dealing with the everyday punks on the street. Always ready to fight and always winning his fights, he just finds himself in more and more trouble. Along the way he surrounds himself with friends who are all very strong in their own unique way. It's from the same mangaka of Bremen.

Rookies
Professor Kawato is the new japanese teacher in the ill-famed Futagotamaga High School, whose baseball club is composed by thugs and bullies who have been suspended for a year from all school competitions for causing a brawl during an official match. Now that the suspension is over, the only club's members left are interested only in women, smoking and doing nothing until, under Professor Kawato's guidance, they discover a new dream called Koshien. The road to Koshien is far from easy as many obstacles awaits them.

Rokudenashi Blues
Maeda is a new student in the Teiken High School. He stutters when he's nervous and he's rather clumsy. He gets noted immediately because he hits a teacher during the entrance ceremony. Some clubs search to enlist him as they see in him a force they can use to get even with other clubs. But Maeda is a loner and has only one dream: becoming boxing champion. His first objective is to beat the leader of the boxing club. "Rokudenashi" translates as "good for nothing".

great mangas try readin them.