Millions of years ago, in a kingdom deemed as Caelus on another planet different from ours, humans and angels lived together in harmony. It was peaceful and serene for the longest of times. People were happy, angels were peaceful and helped humans with tasks that they couldn't do themselves. For a time, all was good and life was easy and simple. Everyone had friends, family and a good future ahead of them.

Once a year, a nasty storm known as the Yearly Storms came. Everyone went into hiding during these storms in fear of the electrical bolts of energy that shot from the skies. These bolts were those that angles used for energy, as they did not eat or sleep. These bolts did not appear visibly or audibly to mortals or in any way they could detect unless told by an angel. No one knew what would happen to a human if struck by these bolts, and no one really cared to find out.

However, in a year close to our current time, a human male and a female angel got curious and decided to venture out of hiding during the storm to do the unthinkable; let a mortal being take in these bolts. So, on the first day of the week that the storms were active, the two beings took action and ventured outdoors. The female angel, known as Akane, caught an energy bolt and instead of using it for her own gain, she crumbled the bolt into ash. Akane the female angel spilled the ashes into a canteen filled with water for the human, as swallowing the bare energy bolt could be fatal.

The male mortal drank the now sweet-smelling liquid and a bright light suddenly appeared. The human grew wings, similar to an angels, and took flight.

Humans found this discovery intriguing, and became selfish. More and more became aware of this "secret" that was slowly becoming a well known fact, and all throughout this time, Akane was slowly taking over the kingdom Caelus. Humans neared the brink of extinction quickly and those that had not already undergone the transformation from human to angel were sent to another planet called Earth along with 5 angels. One angel represented light, another water and ice, another air and lightning, another for fire and another for earth and minerals. Akane soon heard news of these fleeting angels, and when they turned 13 years old each, she sent demons to Earth to destroy these angels and wreak havoc upon the humans of Earth.

Now with a whole planet and a kingdom of another planet resting upon their shoulders, these five angels must fight Akane and her demons to once again claim Caelus, and save the people of Earth from destruction.