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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