Hana no Asuka-gumi!

The story

While the adults were devouring the country in peace the young girls are now plunging into the Sengoku Period. A domination of fear and terror by the Zenchura, a federation of banchos nationwide, began. With 80% of the nation's middle schools already under its control. Yet, there was one girl who was determined to crush those wicked ambitions. Her name is Asuka Kuraku.