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.

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.

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.

Seishou Academy is on their annual retreat. A private beach, fun in the sun, and designated shooting areas makes it an enjoyable time. That was until three students were shot in vital parts and war was declared.

The girls have split up into two teams, Ichiroku/Shigu and Funco/Eru. The goal is to flank the attackers in the train station. Ichiroku gets hit by a shotgun blast and Eru’s magazine catch is damaged. What is the attacker’s endgame?