Ever since humanity encountered aliens on the moon, technology has advanced by leaps and bounds. Half a century later, while most people live comfortably, Robby Yaji and Hacchi Kita struggle to find their footing in this high-tech society. Robby, a man constantly plagued by bad luck, owes significant debts to loan sharks after losing money on dubious get-rich-quick schemes, while Hacchi finds it hard to shake off the monotony of his ordinary existence. Their lives take an unexpected turn when Yang, the head of a loan shark syndicate, dispatches Hacchi to collect Robby’s debt. Instead of paying, Robby launches into space, heading for Isekandar, a planet rumored to bring happiness to all who visit. Seeing an opportunity for much-needed thrills, Hacchi joins Robby on this journey, which is packed with alien encounters, giant robot battles, and various mishaps—all while evading Yang and his associates, who are scouring the universe in a desperate attempt to track them down.