A young girl leaves her home on Mars with a dream to be a space pilot. Once in the capital, Nono meets top pilot Lal'C during a space monster attack, and joins the Solar Defense Force. Shockingly, Nono is revealed to be an android, thus unable to achieve elite Topless status and is stuck as Lal'C's largely-ignored trainee. Nono then decides the best way to advance is by recovering a lost Buster mech for herself to operate like the Topless do. She receives such an assignment and heads to Pluto.