Harvest. The Myrioi Sequence, #1

An evil Empire. A boy that nobody remembers. And a girl who must remember him, or die. Growing up, the farm is all that seventeen-year-old Trysk has ever known. Crops, livestock and the ever-present Kleps have been her entire world in one small, unchanging corner of an Empire that spans a thousand worlds and has lasted ten thousand years. Every year like clockwork, the Harvest ship comes to collect the Emperor's share of grains, livestock, and your eldest child. What happens to those who are taken? Nobody knows, because none of them come back.
Not a single person. Not ever. Her farm is supposed to be fallow this year, where Trysk is to raise a family. However, the Universe seems to have other plans when a strange boy arrives on her farm just before Harvest. He's the oddest person she's ever met. Then why is it so hard for her to remember him? But remember him she must, as her life-and the fate of the galaxy-depends on it.~~~Reader guidance: There are horror aspects and gore in limited scenes.
Suggested reading age 17+.