Help finding a manga

A long time ago, I read a manga, and it was about these twins, but they didn't know they were twins. And well, one of them knew they were twins and. Then one day, one of them was crossing the street and the other got hit and blah, blah blah. And so the other twin pretended to be severely injured, so the other one would have to go to an all boys fighting school in his place. I can't remember the name and I would really like help finding it please.