Summary
Far beneath a ruined surface world, Simon spends his days digging through the earth while humanity survives in isolated underground villages. His quiet life is pulled apart when he meets the fearless Kamina and the sharp-shooting Yoko, then discovers a small Gunmen that gives them a chance to break out of the darkness and face the world above.
The surface is not the freedom they imagined. It is a harsh wasteland ruled by Beastmen and giant robots, where scattered humans fight to survive under a sky many have never seen. As Simon travels with his new allies, the story grows from reckless adventure into a larger battle shaped by loss, war, friendship, and the struggle to keep moving forward.
Blending explosive mecha action with comedy, drama, and science-fiction scale, the series follows a shy boy’s coming of age through battles that stretch from underground villages to the edge of space.
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