- It starts with the old Kyoto-sensei (Namase) with a problem class 3-D. Yankumi (Nakama) is the teacher of a class on a remote Japanese island but is fired. She joins the Kyoto-sensei and discovers (oh surprise) that she gets the difficult 3-D class.
The class is mess, they all look like gangsters and make a lot of noise, until a very quiet one at the far end of the room tells the others to be quiet and they all obey and sit down. Yankumi finds out he's the Boss of the class.
One in the class tries to hit Yankumi, she avoids his fist but pretends she did not do it in purpose. Within the other teachers, there are 2 others nice-looking young women that the bad behaving kids talk about. The former gym teacher Baba joins the school but surprisingly forgot Yankumi's connection with a Yakusa family. One of Yankumi's kids is wrongly accused of a theft, everybody thinks he did it except Yankumi, she fights for him and finally the police let him go.
While bad boys are beating one of Yankumi's students, she comes into a hangar and beats them all while doing a speech. While running to school, Yankumi collides with a man that becomes the white knight of her dreams.