根据日本真实的历史改编，故事发生在日本江户时代的元禄年间，也被称作“元禄赤穗事件”。赤穗城主浅野在江户城中刀伤吉良，被幕府将军纲吉处以即日剖腹自裁。以大石内藏助为首的四十七名武士卧薪尝胆一年零九个月之后闯入吉良宅邸，杀死十八人，将首级供到浅野墓前，随后众人齐齐切腹自杀。 Keanu Reeves makes an explosive return to action-adventure in 47 RONIN. After a treacherous warlord kills their master and banishes their kind, 47 leaderless samurai vow to seek vengeance and restore honor to their people. Driven from their homes and dispersed across the land, this band of ronin must seek the help of Kai (Reeves) — a half-breed they once rejected — as they fight their way across a savage world of mythic beasts, shape-shifting witchcraft and wondrous terrors. As this exiled, enslaved outcast becomes their most deadly weapon, he will transform into the hero who inspires this band of outnumbered rebels to seize eternity. Composer Ilan Eshkeri’s (Kick-Ass) epic score offers a powerful and exotic mix of cello, percussion and flute with symphony orchestra, capturing all the color, action, emotion and drama of the story.