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On a primary school trip, he was left behind all alone. During a junior high camp, once again, he found himself alone. In high school, during a field trip, the same thing happened – he was left behind. Finally, he became a university student, but what difference did it make? This time, he was left behind by all of humanity! As everyone departed from this world, he stood as the sole guardian of Earth! A legend will unfold when humanity returns and disaster strikes!