Li Cheng is a world-record speedrunner who has cleared the PC version of Tian Chuang Chu Sheng System more times than anyone else. When Quantum Technology recruits him to test their new panoramic game cabin, he skips the tutorial, memorizes the manual, and dives in—only to wake up inside the Witch Altar, a hidden opening unlocked after the eighth New Game Plus and the game's most difficult starting point. There he meets Lilith, a silver-haired, red-eyed nun who claims to be the Savior Goddess and tells him he is the Son of Destiny meant to save the world.

Li Cheng, however, treats everything like a speedrun. He strips monsters for materials, exploits obscure breeding mechanics to farm experience, and uses his trash skill [Sorry, You Didn't Let Me Have Fun] to reset enemies to full health so he can kill them repeatedly. As he blazes through content meant to take weeks in a single day, Lilith grows increasingly terrified that this so-called savior is actually a devil.

But the world is watching, and rumors are spreading that the man who cleared the impossible altar is not a hero at all—he is an Evil God.