For the past six months, Aiko has been traveling from world to world, cleansing the galaxy of the darkness that nearly devoured her and her friends. But when Aiko starts having visions she can't explain, her task of destroying the darkness wherever it hides turns into a search for the reason why she's started seeing things. Learning the truth will bring Aiko face-to-face with a mistake from her past that will force her to choose who she can trust with her secrets...