故事以经济泡沫时代的银行作舞台，当时经济繁荣，加入银行就等于一生无忧，银行家是精英的代名词。主角半泽直树就是当中的精英银行家，在东京中央银行的大坂西支店当融资课长。
他听从浅野支店长的指示，向西大坂钢铁进行5亿元的融资，当中并无担保。该公司表面上是优良企业，但暗裡却隐藏著莫大的负债，结果公司在融...资3个月后倒闭，半泽及一众银行职员被指合谋骗取融资。
浅野支店长为了个人前途，把所有责任推到半泽一人身上，银行东京本店传召半泽出席调查听证会，他强烈否定骗财，并立下誓言会取回5亿元的融资。正义感强烈的他由这里开始，为了和银行内外的敌人对抗，进行组织和战斗。
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