Is there by any chance a prequel to the story? Like about the parents?

And how they got together? I really wanna read their love story!

Per the author’s twitter the next volume (after matsu’s and yuuki’s story) is about masaki and hiromu’s backstory..... so yeah there will be

yes it's this one
http://www.mangago.zone/read-manga/itsuka_koi_ni_naru_made/

wait I'm so sorry i mistaken this for another one jsndjjd