Responses
Maybe not all of them being about childhood friends, but these ones have the seme searching for the uke after getting separated:
http://www.mangago.zone/read-manga/lack_of_love/
http://www.mangago.zone/read-manga/a_man_like_you/?8lSK
http://www.mangago.zone/read-manga/cosmic_boy/?irYm
http://www.mangago.zone/read-manga/hanagara_tsumi/
http://www.mangago.zone/read-manga/boku_no_omawarisan/
Thanksssss ε=ε=(ノ≧∇≦)ノ
You’re welcome
Any recommendation that goes like this, so the uke and seme has been together (like childhood sweetheart) then the uke left the seme. So the seme searched for the uke.