The anime is very different from the tankoubans I read. There are only 2 episodes of the anime so I suggest reading the tankoubans if you are intrigued by the series. ;)
Nonoka is lucky to be protected by these 2 boys, wonder why they refused to show their real emotions in front of her. Hajime's importunate behaviour is a big repellent...
Cleo18, I think it was both of them, because when they first show the boy standing in front of her, his hair is yellowish. But then, the boy who threw the other guy had dark red hair, like the other judo boy.