So there was an anime I watched about 4 years ago. Its about a fighter who is getting revenge for his fathers death. His dad was a boxer and the man who killed him had an eye patch. While training for his revenge he uses a machine where he is strapped to the wall with rubber band like things while he has to hit a punching bag. Please help this is all I remember. And at the end he fights the man with the eyepatch. The man enters on a helicopter.
