A human girl named Aiju sneaks off to sightsee at an abandoned ancient tower. By a twist of fate, she “encounters” the legendary “Six Angels of Perception,” who are said to protect the human world.
But could these beautiful, powerful angels really have troubles of their own?
As time passes and they grow closer, one incident and crisis after another comes to light. A sleeping spirit king, a fallen prophet, a rebel angel who vanished long ago... When these clues are linked together, they point to the “prophecy” that the angel of “Song,” Yajier, has been searching for so desperately!
But why, when Aiju finally understands everything, is all she has to show for it an overwhelming sorrow?
