Of Tokyo Osaka west central bank branches and loan manager Naoki Hanzawa (Masato Sakai) was He joined the bank in the bubble economy last stage, the so-called "bubble He joined set". Currently 20 years as have elapsed from it, it had become a generation to play a central role of business in a row. Working for the Tokyo head office loan department passed Mari Nin (Mitsuhiro Oikawa) is a synchronous lines Lines set and Hanzawa, close relationship of He joined since. The advice frequently, and continue to follow the Hanzawa. Meanwhile, at home, his wife Hana (Aya Ueto) is supporting her husband in a bright honest personality even while complaining.
In such Hanzawa, branch manager of a sudden one day Asano (Ishimaru stem two) it was decided that aggressive instructions from down, to attach the loan agreement of 500 million yen from west Osaka Steel. Moreover, despite the borrower for the new condition is "unsecured".
Osaka west branch who achieved sales target by this loan was supposed to be picked for the prize for the first time the most excellent store prestigious prize. However, Western Osaka Steel looked to blue-chip companies seemingly has had a huge debt in the shade, window dressing that was going to hide it is discovered. After three months away from the loan, west Osaka Steel went bankrupt unsatisfying. As a result, Tokyo central bank has become a thing to be cheated the 500 million yen total loan amount.
Asano branch burning obsession to success is orchestrated to try to impose Hanzawa Kazuto the full responsibility. Plays a quick rise to fame unusual in Tokyo central bank, was Noboritsume to the managing director Owada (Kagawa Teruyuki) lay the groundwork up to. The resulting city banks suffered huge non-performing loans during the bubble period through the merger of Tokyo central bank, "mega-banks". The line, and divided into factions, "former central bank industry" graduates, the "old Tokyo First Bank graduates" after the merger, had repeatedly fierce
京中央銀行大阪西支店・融資課長の半沢直樹（堺雅人）は、バブル経済末期に銀行に入行したいわゆる「バブル入行組」。それから20年ほど経過した現在、行内では業務の中心的役割を担う世代になっていた。東京本店融資部に勤務する渡真利忍（及川光博）は、半沢と同期入行組であり、入行以来の親しい仲。頻繁に助言をし、半沢をフォローし続ける。一方家庭では、妻の花（上戸彩）が、文句を言いながらも明るく実直な性格で夫を支える。
そんな半沢に、ある日突然支店長の浅野（石丸幹二）から強引な指示が下り、西大阪スチールから５億円の融資契約を取り付けることになった。しかも、新規の融資先にも関わらず条件は「無担保」。
この融資によって営業目標を達成した大阪西支店は、名誉ある最優良店舗賞を初受賞すことになった。しかし、一見優良企業に見えた西大阪スチールは陰で莫大な負債を抱えており、それを隠すために行っていた粉飾決算が発覚。融資からたった３か月後、西大阪スチールはあっけなく倒産した。この結果、東京中央銀行は融資額５億円全額を騙し取られることになってしまった。
出世に執念を燃やす浅野支店長は、その全責任を半沢一人に負わせようと画策。東京中央銀行で異例のスピード出世を果たし、常務にまで上り詰めた大和田（香川照之）にまで根回しをする。東京中央銀行は、バブル期の膨大な不良債権に苦しんだ都市銀行が合併して出来上がった「メガバンク」。行内には、合併後も「旧・産業中央銀行」出身者、「旧・東京第一銀行出身者」の派閥に分かれ、熾烈な権力争いを繰り返していた。大和田常務は「旧・
어느날, 한자와가 융자과 과장으로써 근무하는 도쿄 중앙은행 오사카 서부지점에서, 지점장 아사노로부터 "서부 오사카 철강"으로의 대출 이야기가 나온다. 지점장은 최우수 지점 수상만을 목표로 하는 사람으로서, 한자와는 충분히 대출에 대한 검토를 하려 하지만 지점장에 의해 결국 무담보 5억 대출이 결정된다. 마침내 서부지점은 최우수 지점 상을 받게 되었지만, 서부 오사카 철강은 이후 분식회계가 드러나게 된다. 회사는 파산하고 사장은 도주하여 5억원은 회수 불가능의 상태가 되는데...
東京中央銀行大阪西分行融資課課長半澤直樹，在分行長淺野強硬的指示下，給予西大阪鋼鐵5億日元無擔保的貸款。雖然半澤對該公司有所保留，但輕信了淺野分行長「將自己承擔全部責任」的保證而簽下貸款合約。然而，該公司表面上雖是一家優質企業，實際卻為隱瞞巨額債務做了假賬，在接受貸款後3個月就倒閉了，5億貸款無法收回。淺野分行長企圖將全部責任推給半澤一個人。半澤毫不退縮，在總行的聽證調查會中，發誓無論如何都要奪回5億貸款，力圖為自己洗脫冤罪。
東京中央銀行大阪西分店融資課長半澤在分店長強硬的指示下，對西大阪鋼鐵進行5億日元無擔保的貸款。
半澤雖然對錶面上經營良好的公司有所保留，但因不能違背分店長的意思只好簽下協議。但該公司因揹負鉅額債務在3個月後倒閉，騙取了銀行的5億貸款。
支店長則策劃將全部責任都推給半澤，然而半澤卻拋出收回5億貸款的宣言。
東京中央銀行大阪西分行融資課長半澤直樹(堺雅人飾)，是在泡沫經濟末期進入銀行，就是所謂的”泡沫入行組”。過了20年後的現在，終於成為在行內擔任融資業務的中心角色。有一天，分行長淺野(石丸幹二飾)近乎強迫指示，要半澤融資給西大阪鋼鐵5億圓。而大阪西分行也因為這筆融資達成營業目標，並且得到榮耀的最佳分店獎...
