After My Rebirth, My Dead Brother Is Seven

Synopsis

The last human alive in a ruined world cut down the demon king, and died of it. She wakes one year old in a spotless nursery, unable to make a sound, and the iceberg king who lifts her onto the naming stone wears her dead father's face. Her brother is seven and still breathing. But her mother is gone, her father will not look at his own son, and the system that dragged her here glitches out every time it matters. Then a principality nobody has seen in a century arrives carrying a crystal coffin, and the boy asleep inside has a face she has seen before.