Crows Zero (Kurôzu Zero) [2007]-messi9

The story takes place before the events of the manga Crows (Takahashi Hishori) about fueding high-school gangs, hence the title “Crows Zero”. Takitani, a transfer student attempts to take over Suzuran Boys High School and is mentored by old boy yakuza Katagiri as he faces off against his rival Serizawa.