1800年前，中国流传着一种古老的拳法——北斗之拳。该拳法以人体内部穴道为打击对象，由内至外达到毁灭对手的目的。为了防止武功外泄，北斗之拳向来一子单传，只有真正的强者才可成为拳法的继承人。至琉泉一辈，他收养了三个养子，分别是拉奥、托奇和健四郎，北斗之拳终于迎来1800年来最强的时代。与此同时，地球上愚蠢的统治者发动无休止的战争，最终导致人类文明毁灭，世界堕落到暴力至上的时代。在乱世之中，三兄弟以不同的方式展开了波澜壮阔的人生…… 本片根据原哲夫、武论尊的经典漫画原著《北斗神拳（北斗の拳）》，是《真救世主传说 北斗神拳》的第一部。
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