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A group of demons in the ancient Japanese capital of Heian is dismembering members of a family of Japanese nobles.

Madoka Koga, who maintains her fierce attitude from her delinquent days, but is still a virgin; Chiyo Fukuma, a woman who treats shoujo manga as bibles for romance; and Sawako Chidori, a woman who can't help but always fall for poor excuses for men. The story centers on the three women who meet each other while carousing at night, telling each other bad stories of men they have met or dated.

Two prisoners managed to escape after the police truck carrying them crashed. One of them ,is a gangster. The other called “Otowa YonKo” – our protagonist – is a con artist whose cheats money from criminals or terrorists. Accidentally, “Otowa Yonko” then becomes the new teacher for the nearby high school, under the new name “Hachisuka Goro”, and according to a deal of “Hammer Session” with the headmaster. In other words. A swindler who escapes from prison and assumes a new identity as a high school teacher. He conducts his classes in an extreme style known as a 'Hammer Session', forcing students to become stronger.