This part of the series depicts the tragic moment in the main character's past that led her on the path of a wandering fighter who possesses the power of the titular “Astral Ki”. During her childhood, Akari used to be a carefree and optimistic fun-loving girl that lives with a wise and peaceful old man (or anthropomorphic tanuki and cat hybrid, more precisely). But as the unknown enemy forces attack the world, including her home, she's facing the fight that will change her life forever.