Bad boys are gathered to Shuten Private Academy in a solitary island in the Sea of Japan. They are trained to become person who engage in secret maneuvers in the underworld. There is an urban legend that a naked heroine called Sexy Mask fights with evils in the Academy. A correspondent of Media Group FNB snake into the Academy as a student to secretly inspect there. They mark new male teacher， Yoshio Mita and finally get a decisive image that Yoshio Mita’s real identity is Sexy Mask. Crew cooperate with Yoshio Mita to disclose the Academy. However their camera takes a scene that Sexy Mask has a mass attack by discipline committee members!

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