The purple sun soars in the sky, and the sky is torn apart. An unknown cosmic storm sweeping the world - the "Energy Tide" - has pushed human civilization to the brink of destruction. Cities were reduced to ruins, the landscape was turned upside down, and the deadly flow of radiation particles was like the whisper of death, harvesting fragile lives. The old order has collapsed, technology has been reduced to scrap metal, and survivors are struggling among the ruins. What is even more terrifying are the mutant beasts that awaken with the tide, and the darkness that grows deep in the human heart.