The Rules for Developing a Girl with Red Eyes

(Single male protagonist + apocalypse + multiple female protagonists + cute girl development + combat + daily life) In the sixteenth year since the birth of the red spherical virus, human beings huddled in the high-walled city. Mo Lan originally wanted to live a peaceful life in Huiqing. But his sister Mo Ling is a red-eyed girl who is infected with the virus and has owl vision and perception. The special status of their sister is destined to require them to bear a lot of things... One day, an order from his superior was delivered to Mo Lan. "Huiqing is being attacked by a tide of beasts, and your new partner is there." At this moment in Huiqing, a girl with black hair and red eyes was sitting on the city wall, wiping a bloody knife.