Arknights: The Red Guerrillas

Also known as: "Terra, I'm the Fourth Catastrophe." Because he went too deep into arguing over historical evidence, Su Chen transmigrated to Terra and got a Paradox System. A ghost, a ghost haunting the skies above Terra. Terra, don't sleep too soundly. The big one is really coming. For a long time, the people of Terra who sought to glimpse the future in the river of history had imagined an impending catastrophe, one that would threaten the lives of all intelligent beings. Only unprecedented unity and a willingness to press on, generation after generation, could overcome it, assuming it could be overcome at all. For now, hope seemed faint. Popular predictions about the nature of this catastrophe were wildly imaginative, ranging from an invasion by the Seaborn to demons from beyond the realm. But... it is now obvious that the catastrophe has always been you.