―18XX AD. The Magura Empire was suffering from a severe shortage of personnel during wartime. The government then implemented a policy to forcibly impregnate young women. In such circumstances, an order finally arrived at my place. The target is my sister Haruka. She is a kind and gentle sister who takes care of me while I am sickly. The sister who can only obey the government's orders begins sibling incest under military supervision. Yoo follows instructions. The directions from a soldier trained in copulation guidance are precise and top-notch for producing superior sperm. I inadvertently came from my sister―.
