Musket Girls! ~The Reincarnated Staff Officer and the Maidens of the Line~

I was reincarnated into a modern-era-style war world where lines of infantry fired at each other. As a commoner second lieutenant, I was shunned as the "Grim Reaper" and assigned as a staff officer to the all-female 6th Special Duty Brigade. The brigade commander who seems to be plotting something...