Two prisoners managed to escape after the police truck transporting them crashed on the highway. One of them, Imamura Shouhei, is a gangster who has sent ten rival bosses to the hospital. The other, known as Yazawa Yuu—our protagonist—is a con artist whose fraudulent activities have accumulated to approximately 100 billion yen. By chance, Yuu then becomes the new teacher at a nearby junior high school under the alias Hachisuka Gorou, pursuant to a deal involving "Hammer Session" with the headmaster.