So they get back together or what?

didn't look like it...and now I'm pissed off for reading it (╯°Д °)╯╧╧

I think it's a one shot because the mangaka wants us to choose their ending. The black haired guy did say "he wants it to happen"

I think this kinda explains it

http://www.mangago.zone/read-manga/rakuen_no_ori/mf/v01/c005/57/

Wrong link. The page before that