好吃懒做的龙子太郎（加藤淳也 配音）和奶奶（矢吹寿子 配音）住在贫穷的小村子里。一天，奶奶向太郎讲起了他的身世。太郎的母亲（吉永小百合 配音）怀孕时饥饿难忍，便打破禁令吃了村里的岩鱼，不料就此变成了龙。龙生下太郎后，留下宝珠作为母乳，并告诉奶奶等孩子长大后让他去北国的湖来找她，就此飞空而去。太郎即日启程，去北国找母亲。 在去的路上，太郎的青梅竹马的阿雅（富永みーな 配音）被黑鬼（北村和夫 配音）抓走，太郎打败黑鬼，救出了阿彩。一直被黑鬼骚扰的村人非常感激太郎，请他美餐了一顿。太郎吃着自己从来没吃过的喷香的米饭，流下了眼泪，他多么希望自己家乡的人们也能吃上这样的米饭啊。村人还将一面镜子和日行百里的马驹送给太郎作为谢礼，太郎将宝物转赠阿雅，让她先回家，自己继续踏上了旅途。太郎在山里遇到大雪，遭雪女袭击失去了意识，太郎能突破重重险阻找到母亲吗……
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