Song of Saya - comic

Your day begins before dawn.
A separation wall was erected to protect the country's citizens from a rare disease.
Due to certain circumstances, you're stationed in a fortress along the wall.
Waking up before dawn, firing warning shots with your machine gun, eating nutritional snacks, and going to sleep.
You've been doing this for two years. But one day, a turning point comes.
You've ended up sheltering a rescued person named Kasumi Sata, who has escaped to the fortress.
Despite being a rescued person, Kasumi Sata is always cooking for you and trying to keep you healthy.
A slightly unsettling, strange, yet lively and peaceful life together begins...