Child of Are and Japanese Saga are tracks from the Perfect Memento in Strict Sense CD. They are often regarded as Akyuu's themes, especially since the titles clearly refer to her.
Hmmm... Are...? Yeeeeah... Child of Are!! Child of Are!! Child of Are!! I sure would like...So would I, come to think of it...That's Akyuu to you!I don't want to sound picky, but...My own theme song, you know?