Life 1/3. The Story Told by Chronicler Rhapsody

Thirty centuries ago, after a catastrophe that wiped out the previous civilization and made the Earth uninhabitable, the remnants of humanity moved to near-Earth colonies. Due to living conditions different from Earth, the appearance of people has changed, and the average life expectancy has been reduced to forty years. Resources in near-Earth colonies are limited, humanity relies heavily on highly advanced AI 'Mother', which plans almost all areas of people's lives, including the choice of marriage partner and workplace.
But even in space, life has not become calm. From time to time, the mysterious Veils attack near-Earth colonies. They are rebels who have left the near-Earth colonies, who dream of destroying the colonies and exterminating humanity.
Stella and Astra are twin sisters living in the Azul-1 colony. They are celebrating their coming of age and preparing to graduate from high school. Their childhood friend, Chris, dreams of confessing his feelings to Astra. But they still do not know that the shadow of tragedy has gathered over them...
What will happen to Astra, Stella and Chris? And who are the Veils really? What will be the story that the girl Rhapsody, Chronicler of the Earth, writes in her volume of the Star Chronicles?