Funko, Ichiyon, Eru have failed and are required to take remedial classes. Their older sisters from Seishou Academy High School Division have come up with plan to help. School is war.
Seishou Academy is a school for very unique girls. Their new homeroom teacher gets a crash course lesson in how special they are, from models numbers to underwear.
The Japanese teacher is learning more about his students, and on a trip to the high school he gets to meet their older sisters. Funco, Eru, and Sigu lead a group of elementary guns on a volunteer cleaning trip.
