Yes. 'More Than a Married Couple' manga came to an end. The creators decided it was time to finish the story and leave it on a satisfying note for the readers.
The 'more than a married couple light novel' could be about various aspects. It might focus on characters who are in a relationship that has more depth or complexity than what is expected in a normal married couple. For example, it could involve characters who have to deal with extra - marital attractions, or it could be about a couple who have an unusual living arrangement that makes their relationship seem more than just the traditional married - couple setup. It could also be about how society views such relationships compared to the norms of a married couple.
Well, the ending of the manga sees the characters resolve their conflicts and find true love. It ties up loose ends and gives a sense of closure. There are some unexpected twists along the way that keep it interesting.
I'm not sure as I haven't read it, but usually in such novels, there are two main characters at the center of the relationship that is 'more than a married couple'.
You can try some popular manga reading websites like MangaDex or MangaReader. They often have a wide range of manga available, including More than a Married Couple.