Riguel runs out of the medicine that keeps her partner Azumi's disease in check and returns to the blue world to get more. There she learns a shocking truth about the relationship between Azumi and the blue world. As she is torn between Azumi and her loyalty to the Blue World, she is confronted by a Battle Dress that looks just like her.
One of the Twelve Apostolic Angels of the White World, Aquarius Gambriel, suddenly appears before Azuma. But Fierte is uneasy at the appearance of what should be a friend. Meanwhile, a different group of angels than Gambriel are searching desperately for what they call the Angel Killer, a girl with a black Z/X.