Enka: Gold Rush (2015)

Art instructor Kumagai works for a private Osaka high school for girls, but his salary is at a discount to certified teachers. Sakai, the school's chairman, runs the school like his own. One day, Kumagai is approached by music teacher, Naoko and physical education teacher Oyamada who seek to confront Sakai with proof of his wrongdoings and secure their own positions. Things are still going well up to the point they boldly venture into the apartment of Sakai's mistress, Akemi. But after that, Sakai and Akemi disappear. The couple seem to have been kidnapped by the "education consultants" Minowa and Nakao for some reason. Kumagai and Nahoko unwittingly get involved in a scheme to steal the vast amount of gold bars which are Sakai's hidden assets. Who are the real criminals? They deceive and get deceived as a struggle for the gold bars begins around Osaka and Kobe.