An alien system invades the earth and launches an evolutionary activity for all mankind called "Operation Crossing the River." Human beings are forced to participate in various bizarre games again and again. Those who survive the game can evolve. When a young and promising psychology professor entered the game for the first time, he met a mute boy with great skills. Later, he discovered that this boy seemed to have many secrets...
Intention: Alien systems simply and crudely reduce the earth's population