https://www.dlsite.com/maniax/work/=/product_id/RJ01034061.html

Your day begins before dawn. A separation wall was erected to protect the people of this country from a rare disease that has broken out.
Due to certain circumstances, you are stationed in a fortress along the wall. You wake up before dawn, fire warning shots with your machine gun, eat a nutritional snack, and go to sleep. You have been living like this for two years.
But one day, a turning point comes. You end up hiding a person in need of rescue, Saya Kasumi, in the fortress.
Despite being a person in need of rescue, Saya Kasumi cooks for you all the time and wants to make you healthy, and so begins your slightly unsettling and strange, yet lively and peaceful life together...

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