They look like this couple - http://www.mangago.zone/read-manga/rutta_to_kodama/
but actually, they are not.
They're from this series -
https://www.mangaupdates.com/series.html?id=846
You might want to skip some volumes if you want to read about the two of them going out. Because the first story is about their brothers and they were still kids. But I recommend that you don't skip cause it's a good read and also give background story. The picture you see in your link was when they ran away from home and went back to their hometown. They were sitting in the train station.
I had to share the first link because that story was also cute, Teehee!
Have a good read! ╮(￣▽￣)╭
Thank you so much ヾ(☆▽☆)
http://www.mangago.zone/read-manga/free_punch/an/free-punch-chapter-4.html/1/ can anyone tell me what manga this is?