in the firs chapters a kid sees a class mate i think fithing in the park or forest with a man the he helps her and some things hapen then he gets a sword that can turn into a girl and she had cut him whe he was little and there two tipes of swords firs ones like the girl and the other ones control the persons that hold the and kill people

its kandachime

thanks a lot that the one some pleople in other sites said elemental gladen and i put a similar description