Yup I think you're right to my view
Ok, so I'm not sure if you can call these as "blends well".
These are just a few titles which I think romance is not the main point (although MangaDex tags some as such),
but when the romance happens, I think "aw, that's cute, I like that"
-
Angel Densetsu
The main theme is comedy and delinquent. I like the romance slapstick comedy there because it fits the absurdity of the characters and the situation depicted. If you can handle the artsyle that is.
-
Baby Steps
The main theme is school and sport, and with a female main character presents, romance plot is always expected. But I like the no-nonsense romance and confessions, relationships grow as encounters increase, rejections and rivals are handled like how a normal people would. And that the romance is not the main point, it is actually used as a plot device: use romance as a motivation
-
Kemono Jihen
There is just one instance of romance (That is if you can call it romance as it is still borderline between like/love or just simply admiration). But I think that was cute.
-
Kono Oto Tomare!
I'm hesitant to put this because, well, the theme is school, so again, romance is obviously expected. But since the main theme is the music, there's no unnecessary side romance plots (so far). Straight up romance, realization, acceptance, now back to music.
There are also other titles where I have high hopes that the romance will be quietly brewed in the background, like
Magus of the Library