Battle Heart

Shinichi lives in the New York suburbs with his parents and sister. However, the day before his sister's wedding, Shinichi comes home from work to find the 3 of them lifeless in a pool of blood. The murderer, a 16 year old named Dog Kaiser is given a light sentence despite Shinichi's insistence on the death penalty. So, he takes it into his own hands and ambushes Dog where he says "I didn't kill your family!! I was set up!!" Both of them return to New York, set on getting revenge.