A melancholy boy who is addicted to games dreams of becoming a space merchant engaged in interplanetary trade. He and his playmates set out carrying a bag of scarce goods on the moon. On Mars, they drilled into Mount Olympus, the highest peak in the solar system, and discovered a giant crystal cave and the extremely rare Mother of Crystals. As a result, they were hunted down by Martians hiding underground. In order to avoid being hunted, they strayed into the mysterious black hole between the asteroid belts...
Concept: The greater the ability, the greater the responsibility
