Her "covert" nature means that when she does feel attraction, it manifests not as blushing or stammering, but as small acts of service: adjusting someone’s collar, leaving an umbrella by the door, or a single, sharp sentence that hides a world of care.
Assuming you're referring to the actual title "Suzume no Tojimari" and focusing on character relationships: covertjapan sexlikereal chinatsu suzume full