Hammer Session!

Hammer Session! (ハンマーセッション!) is a manga written by Yamato Koganemaru and Hiroyuki Yatsuand, and illustrated by Namoshiro Tanahashi. It has been serialized in Weekly Shōnen Magazine's magazine from November 15, 2006 to January 8, 2009.

A live-action drama series was adapted in 2010.

Plot
Two prisoners managed to escape after the police truck carrying them crashed on the highway. One of them, Imamura Shouhei is a gangster who has sent 10 opposite bosses to hospital. The other called Yazwa Yuu—our protagonist—is a con artist whose cheating profile has piled up to approximately 100 billion yen. Accidentally, Yuu then becomes the new teacher for the nearby junior high school, under the new name Hachisuka Gorou, and according to a deal of "Hammer Session" with the headmaster.

Other Sources

 * (MAL)