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At the end of the 23rd century, the world's energy and environmental crisis broke out. Countries decided to unite to form the Earth Alliance, establish a maritime city group, march outside the earth, and exploit space resources. The alliance's first target was Titan. An expeditionary force went there on an interstellar battleship and was attacked by unknown creatures on Titan. When reinforcements arrived, only the "General" was left alive, and news about the unknown creatures was also blocked. Ten years later, the Titan space station was destroyed by a mysterious force, and "General" was injured and returned to Earth; in the same year, a natural disaster comet crashed into the North Pole, carrying the "Red in the Rain" virus that swept the world. Monsters called "Red Nightmares" rampaged around the world, defeating mankind and forcing them to retreat to the sea and underground cities. Half a century later, the friction between humans and the Red Nightmare is getting bigger and bigger, the contradiction has reached its peak, the bell of the decisive battle has sounded, and the mysteries hidden in history have gradually emerged...