Ever since she was young, Miku wanted to be just like AquaMarine, a metal fighter. She does become a Metal fighter and fights many battles, she gets a tough trainer and learns many things but then gets fed up with all his training techniques and leaves.. then she meets with one of her friends who was also a metal fighter until she cracked her spine.. she told her that if she really wants to be AquaMarine, she has to defeat her.. and with her story and a few other things she decides that she will fight AquaMarine!, during the fight she and AquaMarine learn that metal fighting goes beyond just getting in metal suits and fighting, that they just serve as a training item, your true power is released when you get rid of the suit. So anyway they fight and.. its an alright anime ;p I saw the subtitled version, im not sure if they made a dub..