Looks like artwork of Yoneda Kou. (Could be from a non scanlated manga but I'm not sure.)
Oh, they are the characters from
http://www.mangago.zone/read-manga/rainy_days_yesterday/
looks like a yoneda kou illustration. don't know if it has a manga but you can start looking through her works.
From the art, yes. But i dont know the tittle .ah... I really want to read. Looks interesting ┗( T﹏T )┛
Thank you so much. ╮(￣▽￣)╭
http://www.mangago.zone/read-manga/bi_no_kyoujin_smoke/nmt/tr_chapter-2/pg-3/