A genius con artist, Otowa No.4, is a "chivalrous thief" who uses his exceptional and handsome looks as a weapon to rip off money from villains around the world. Otowa No.4 is finally arrested, but he succeeds in escaping with Azabu No.10 while being transported under police escort. The two men, who happened to take refuge in a grove of trees at a high school, Hikari Gakuen, strike a deal with its principal, Mizuki Kenichi, and end up working at the school. Otowa No.4 becomes Hachisuka Gorou, a new teacher who graduated from Tokyo University, and makes full use of his swindling techniques to conduct "hammer sessions" for problem students.

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