Committed a crime, get dropped into the depths of hell

Three thousand years from now, this earth will no longer exist due to global warming and pollution. But a race of aliens comes and salvage the earth when it almost got destroyed?
A genetically modified race of aliens, called the Astrions, takes over the earth and renamed it Resnactine, making the human race abide by their rules.
A girl named Celeste, a human, commits a crime and gets sent to abyss, the depths of hell, to wither and die. Such a coincidence, Celeste means ‘heavenly’ in French but the poor girl got sent to abyss, the exact opposite of her name.
In the dark and terrifying place, Celeste met a boy, about the same age as her, and made friends with him although they did not get along at first. Celeste was told a dark secret no one wanted to know, even the Astrions. But it was an important secret. One that would save the broken world.
Will Celeste and the prince of Resnactine make it out and save the world? Or will the world once again end like Earth?