Military!

During a conflict between the Krakozhia Dukedom and the Grania Republic: in the midst of the fighting, a saviour appears to the Dukedom, and it is none other than high school student Yano Souhei`s salesman father.

This puts Souhei in immediate danger though, so two female soldiers — First Lieutenant Rutogarnikof Chuui and Second Lieutenant Haruka Shoui — appear in tanks to "protect" Sou...