In 2801 AD, human civilization knocked on the ultimate door of the universe.
After integrating all the legacies of Ani's balance, Chenxing's contradiction, and Shen Lingfeng's protection, scientist Enqi led the team to touch the insurmountable bottom line of physics in the lunar laboratory - absolute zero (-273.15°C). However, what the breakthrough brings is not god-level technology, but a "sigh" from the end of the universe. A chaotic consciousness called the "Tide of the Past" wakes up. It is the reverberation of the memory of all dead civilizations and the cold harbinger of the fate of heat death.
Faced with cosmic sorrow that is enough to freeze the soul, human beings have no choice but to fight or escape. They built four miraculous "zero wonders" and vowed to give shape to these silent dead - weaving the broken memories of civilization into an eternal "nebula of meaning." This is a war without enemies, a funeral for the dead across the universe. Enqi and her civilization will define the ultimate answer to existence here: when everything will eventually return to heat death, only the "echo" created by life can last forever in nothingness.
