Harumichi Bouya transfers to Suzuran High mid-year, but this isn't just any school, it is know as the Crows School where the rotten of the rotten students go to. Bouya becomes the number one fighter in the school and in doing so he sets off a chain of events of high school gang warfare in the area. 
Crows is the prequel of the manga "Worst", and it a story occurring in Suzuran two years before the story of "Worst."

Worst is the definitive tale about "high school fighting" which takes place in chaos-ridden Suzuran High School for Boys that has a notorious reputation of having the worst kind of students ranging from thugs to delinquents. The main character, Hana Tsukishima, a freshman at Suzuran, comes from a very distant countryside in Japan. Although gentle and warm hearted, Hana is a tough fighter who has no problem facing several opponents at one time. His ambition is to claim the "bancho" status (the head) and unify/bring order to Suzuran by defeating whomever comes in his way with the support of both his friends and upperclassmen who are drawn to his strength and character. At other times, he must fight thugs from rival schools and gangs.
 
(Source: DMP)

In the story, a legendary powerful team called Mugen once dominated a town. The group faced resistance from the formidable Amamiya Brothers, the only ones willing and powerful enough to not give in. In the end, Mugen suddenly disbanded and the Amamiya Brothers disappeared without a trace. Afterwards, a group of five gangs — Sannoh Hoodlum Squad, White Rascals, Oya High School, Rude Boys and Daruma Ikka — take over, calling themselves "G-SWORD" and naming the area "SWORD" after their gang names. (Source: Anime News Network)

A legendary, all-powerful gang called Mugen once dominated a certain Japanese town. But they faced resistance from the formidable Amamiya Brothers: the only ones willing and powerful enough to resist them. In the end, Mugen suddenly disbanded and the Amamiya Brothers disappeared without a trace.
 
Now, a group of five gangs—Sannou Hoodlum Squad, White Rascals, Oya High School, Rude Boys and Daruma Ikka—have taken over, calling themselves "G-SWORD" and naming the area "SWORD" after an acronym composed of each gang's initials.

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