By any chance do you know....?

a movie that i think its Japanese but its about a girl and a few boys that are orphans and they get trained to become good fighters and when they are all grown up they fight each other to the death to see who will go and find the bad guy to seek revenge and the girl wins she goes out with some of the guys with who she train with and her master to find the bad guy... well at the end the girl kills the guy she needed to kill..... its a great movie just i cant remember the name... HELP lol thank you