Book One of The Daughter of Rhea

They told her she was sick. They lied.
The Astraean Empire ended famine, cured disease, and gave its citizens two hundred years of life.
Nineteen-year-old Akari Hara has served the Imperial Princess since she was five years old. She is dutiful, quiet... and dying.
The same illness that killed her mother at twenty-eight will take her before she turns thirty. Every morning and every evening, she takes the compound her physician tells her will keep her stable for as long as possible.
When the boy she adored as a child returns after fourteen years apart, he finds her sick and neglected. He takes her with him.
Within a day, the drug is out of her blood and a city district has rotted to the ground.
The medicine was never treatment — it was control, and the Empire has been doing this to her family for a thousand years.
But Akari doesn't want revenge. She wants to learn what it means to be alive when she'd already made peace with dying.