德川幕府建立，结束了连年征伐的战国时代。就在武士们已经遗忘了何为忠勇的元禄年间，一桩震惊寰宇且影响深远的事件爆发了。赤穗藩藩主浅野内匠头（堤真一 饰）因受吉良上野介（津川雅彦 饰）戏弄愤而拔刀，由此触怒将军，不得已切腹自尽，赤穗藩也遭到倾覆的命运。时过境迁，以家老大石内藏助（佐藤浩市 饰）为中心的武士沦为浪人，但是他们并不甘心主公蒙冤泉下，于是大石及其儿子主税（冈田准一 饰）、堀部安兵卫（木村拓哉 饰）等47名浪人武士苟且偷生，隐忍蛰伏，时刻等待着向吉良上野介复仇的机会。飘雪冬夜，47浪人来到仇家门前，一段传奇历史即将展开。
本片以堀部安兵卫的视角，再现赤穗武士们可歌可泣的复仇大业……

Shinya is in debt as a result of his gambling habit. He attempts to defraud an old woman with a bank transfer scam, but the woman reminds him of his late mother and they start to relate to each other. Meanwhile, Shinya meets a girl called Hisako in town, and ends up helping her to find out the whereabouts of an unsuccessful comedian, Raita, whom her mother was in love with in her youth. Shinya's father, Ryutaro, is disowned by his son after his wife's death. When Ryutaro meets a homeless man called Moses, he starts living on the street as well. One day when the old woman dies, Moses comes to the deceased and confesses his past. Subsequently Shinya resumes communicating with his father Ryutaro.