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Former police officer, Terahara Ken, works for a private security firm. He is suddenly summoned back to Japan while on duty in Taiwan and ordered to protect Matsuoka Takanori, the secretary general of the Democratic Party. At the same time, public prosecutor Sakurai Satoko, who was transferred to the Kochi District Public Prosecutors Office for a previous whistle-blowing incident, returns to the Special Investigation Department of the Tokyo District Public Prosecutors Office in a reshuffle by her former superior for the purpose of indicting a big shot.

In the midst of this, a branch office of Tokyofs Aoba Shinkin Bank is blown up and the bankfs armoured truck is attacked. The bomber who has set the events in motion is a young man called Aoyagi Tomoya. This incident creates a link between Terahara, Matsuoka, Satoko and Ishikawa Aki, who works at Aoba Shinkin Bank.