This is the first out of three gaidens (side stories) that were released after Takahashi Hiroshi finished his famous delinquent manga Crows. It focuses on the pasts of the Ebizuka trio (Mako, Pon & Hiromi), Bandou Hideto and Bouya Harumichi in a total of 3 chapters. It takes place when all of them were still in middle school.
Before Guriko Hanaki reluctantly reigned supreme over Toarushi, he lived in Fukuoka. This is the story about his time kicking ass and taking names in middle school there.
A story that reveals how a pre-6th Gen Head Tesshou Kawachi first encounters and then joins The Front of Armament, and also meets characters like Shougo Murata.
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)
Harumichi Bouya transfers into Suzuran All-Boys High School, a school so notorious for its uniformed delinquents that locals call them the Crows. What begins as one transfer student’s casual brawls becomes an escalating war between factions, gangs, and legends, with bonds forged in violence and loyalty pushed past the breaking point. (Source: Kodama Tales) Crows is the prequel of the manga "Worst", and it a story occurring in Suzuran two years before the story of "Worst."

