The Things I Did While Building a Military in Another World

Qiu Yu, a girl from the modern world, transmigrates. That's right, she transmigrates, and in the familiar fashion, gets hit by a truck!

How will an ordinary girl use her System and technology in a magical otherworld to take on dragon knights who ride wyverns and wield magic in a medieval setting, as well as archmages capable of terrifying forbidden spells? And what about demons from hell, creatures with peculiar ideas about humanity, and the human heart itself...?