Responses
on the very bottom it says: graphic by shirozaki, image from forever more gallery. other than that I have no clue- sorry. maybe start looking from there?!
The manga is scanlated by Blissful sin. They have a habit of putting drama cd covers, novel covers & illustrations on their credit page. It's unlikely that it's from a manga. That's just my guess though. Sorry, I couldn't help you much :(
Thank you anyways. I'm going to search from there then >< thx you 2!
Manga?
http://www.mangago.zone/read-manga/7_nenme_no_dou_kyonin/an/7-nenme-no-dou-kyonin-chapter-1%20(One%20Shot).html/36/