A year after resolving their differences with the Protodeviln, the Firebombers' Mylene F. Jenius, now 16, struggles with indecisive emotions towards lead vocalist Nekki Basara and her fluctuating confidence in her singing abilities. Hoping to match Basara's level, Mylene accepts an invitation to become the lead singer for Jamming Angels. Unbeknownst to her, this decision leads her down an unpredictable path fraught with a conniving TV producer, a clandestine military mission, and Basara's expedition into outer space.