大财团公子哥市之宫行（神谷浩史 配音）自由不知愁滋味，俨然叼着金汤匙出生的金贵少爷，就读于名门学府T大的他即将毕业，未来的人生一片光明，令人欣羡。他铭记市之宫家的家训“不求人，不欠人”，并以此为傲。可是现实的残酷却不得不令他拖欠人情，在开车通过荒川河时，他被几名少年抢走名贵跑车，裤子也被强行扒下挂在桥顶。强逞英雄的阿行爬桥不慎跌落水中，危急时刻被附近的少女小珊（坂本真绫 配音）救助。拖欠了人情的阿行答应作小珊的恋人，他极不情愿地随着这个自称金星人的少女留在荒川河床，并解释了在此生活的一对电波系怪人：河童村长、星星、武士、修女、铁人兄弟等。有趣怪诞的故事就此展开……本片根据中村光的同名漫画改编。
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