Shylock's Children

A million yen goes missing at the Nagahara Branch of Tokyo Daiichi Bank. Long-time customer service staff Nishiki sets out on a mission to uncover the truth together with his colleagues Airi and Tabata. After coming across one tiny question, they find themselves in the face of the massive corruption hidden behind the missing money… but this was merely the beginning of a scandal that would shake the megabank to its very core.
(Source: shochikufilms.com)
~~ Adapted from the novel "Shylock no Kodomotachi" (シャイロックの子供たち) by Ikeido Jun (池井戸潤).