Shylock no Kodomotachi

The setting is the Nagahara Branch of Tokyo Daiichi Bank. One day, a million yen goes missing from the bank. A female employee, Airi Kitagawa, is suspected, but her boss, Masahiro Nishiki, who was protecting Airi, disappears. In addition, Takuji Endo, a co-worker, becomes mentally ill, and all hell breaks loose in the bank.[5] The relationships among the employees at the bank become complicated. The protagonist changes from story to story, including a branch manager who has worked his way up from the bottom, a female office worker in love within the company, and a dull section chief, whose crimes come to light as the reader progresses. What is the truth behind the incident?

(Source: Wikipedia)