Responses
Most likely the big dude (Kowana, or something) is a former gang member that pissed off the other gang. He's a strong dude with a long fuse -- he probably hurt people in the past and is try to atone for his mistakes. That's usually what happens with these kinda things.
what the??, suddenly from a farm to a gang???, what's going on with the story and the setting???, well it's still interesting but i am curious with the relation between a farm school and a gang