One somewhat unique element I do want to mention is the realistic settings of the modern world.
She concludes that their condition is irreversible, and that using their powers are draining both of their life forces simultaneously.
Yoshihiro Ike composed the music, whereas Reiko Nagasawa designed the characters and served as the chief animation director.
However, instead of staying in hiding, Symphonica and the magicarts combine their power to free the world from D2s.