Military!

The story is set during the conflict between the Krakozhia Dukedom and the Grania Republic. Yano Souhei, a high school student, becomes embroiled in the fighting when two female soldiers, First Lieutenant Ruto and Second Lieutenant Haruka, arrive at his house, accompanied by an enemy soldier named Shachirofu who is skilled with firearms. The sudden intrusion disrupts Souhei's everyday life.