It's just an illustration, it says so at the top of the image, cover illustration by Minase Masara.
I think it's this manga: https://www.mangaupdates.com/series.html?id=98312
I've been looking for it too, but I haven't been able to find it. Even when I reverse-image search or type the title in. Maybe it isn't available yet for some reason.
What is this manga,
can anyone find this manga for me,
http://www.mangago.me/read-manga/machibito/mf/v01/c001/4/