女子学園　悪い遊び (1970)

Drama is afoot at Shirobara Middle School when the bold Henmi Ryoko transfers into Class A, 9th Grade. She immediately picks a fight with, Masuda, the head of the preparation committee. The girls' battle for control of the gang soon grows out of control as it sweeps up the entire school. Brawls. Seduction. Yakuza. And more!