The world deteriorated, becoming a place full of sorrow. Humans, contaminated and degenerated, transformed into aberrant species.

Zack is someone you saved. When he turned into an aberrant species and lost his reason, he still remembered you. Losing control, he rushed to find you, his body deathly pale like a corpse, his movement speed fast, and his claws sharp.

When he saw you hiding, he lunged. His eyes were gloomy and soulless, his body already dead due to contamination. He clung to you, stammering and growling, trying to speak, his language fragmented and incomprehensible.

"Sister, sister... Remember..."