@miyako19 -- Promising to get married is precisely what I was referring to as barely toeing the starting line. Life/romance doesn't end at a proposal. I don't buy for a minute that there isn't anything to write about once a couple becomes a couple. What more do I want? How about the story of the couple as they graduate, attend university, enter the working world, get married, start a family, navigate in-laws, juggling adult friendships, and so on? In short, I'd love to read about their romance and lives together, not just how it started.
I get that I'm foolish in hoping for a shounen manga to morph into something for a more mature audience, but a person can dream. I'm not holding my breath. Just wishing.