Try Knights 

A story of High School Rugby. Haruma Riku was once in love with rugby, but abandoned his dreams because he did not grow physically. One day, he meets Kariya Akira, who has amazing physical ability and is as wild as a beast. Riku begins to recover his passion for rugby little by little as he watches Akira's plays. The road to aim for the top of high school rugby begins as these two use "tactics" as their weapons...!