Heaven was vast, like a boundless space.
Higher than the clouds, constantly radiating sacred brilliance, stood the Lord's sanctuary—the place where the Lord resided.
There were different regions within the clouds as well.
The city of the Saints, also called the Holy City, was where angels were born, educated, and lived.
When an angel died, it bathed in holy light and was reborn in the Sacred Pool within the city of the Saints. The pool's power came from the radiance of the Lord's sanctuary. As long as that radiance continued, the Sacred Pool would never cease.
There was also the kingdom of the Prayers, the place of the finest souls and the purest faith from the mortal world.
The land beneath the clouds was also part of Heaven. It was called the homeland of the Saints, possessing the most beautiful scenery in the world—land, mountains, rivers, grasslands... a place untouched by pollution.
At that moment, however, the land beneath the clouds had been engulfed in war. Invaders known as Transcenders were spreading impure flames across the homeland of the Saints.
Within the city of the Saints, angels rose one after another from the Sacred Pool. Without pause, they flew from the clouds to repel the invaders.
For some newly born angels, it was difficult to adapt to such an abrupt battle. Perhaps, in their understanding, it was impossible to imagine that enemies would invade Heaven.
"Metatron! Come here! You're standing at the opening of the Holy City's Defense System cannon!"
The moment the stern voice rang out, the newly born angel Metatron, who had yet to complete her education, froze slightly. She then quickly spread her wings and left the spot where she had been standing.
"Archangel Kami."
Metatron came to the side of an archangel instructor from the school.